Modern Mechanix, August 1934

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20F | RADIO TUBE TRAIN IN CANADA ! N — a AUG. 1934 PE NODER MECHANIK and INVENTIONS SEE PAGE 68

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YOU CAN T BEAT OUR PRICES | And we defy anyone to excel our quality. Every standard brand tire reconstructed by our superior, modern method is positively guaranteed to give full 12 months’ service under severest road conditions. This guarantee is backed by the entire financial resources of an old, reliable company. Here are today’s lowest tire prices. BALLOON TIRES Regular Cord Tires Size Rim Tires Tubes Size Tires Tubes 29x4.40-21 - - - $2.15 - - - 30.85 30x3! -- - 2.36 - - - 75 29x4.50-20=7 - - - 235 - - - 85 31x4 ---- 2.95 -- - -85 3Ux4.50-21 .- - - 240 - - - .85 32x4 ---- 295 --- 85 28x4.75-19 .- - - 2.45 - - - 95 33x4 ---- 2.95 --- .85 29X%4.75-20 - - - 2.50 - - - 95 84x4 --- - B25 - - - 85 29x5.00-19 - - - 2.85 - - - 1.05 32x4% --- $35 --- 115 30x5.00-20 - - - 2.85 + - - 1.05 33x4% --- Bde -- - 115 28x5.25-18 - - - 2,90 - - - 1.15 34x4% --- $45 --- 1.15 29x5.25-19 - - - 295 - - - 1.15 30x5 ---- 3.65 --- 1.35 30x%5.25-20 - - - 295 - - - 1.15 82x65 -=-= BIR -== 1.45 ee ae -- - Ta 2 = re 35x5---- 3.95 --- 1.55 X5.50-18 - - - 3.35 - - - elo i 20x5:50-19 | | I 335 1I I LIS Heavy Duty Truck Tires 30x6.00-18 - - - 3.40 - - - 1.15 | Sizə Tires Tubes 31x6.00-19 - - - 3.40 - - - 1.15 32x6 - - - $ 7.95 - > - $2.75 32x6.00-20 - - - 3.45 - - - 1.25 34x7 - - - 10.95 - - - 3.95 33x6.00-21 - - - ee St m 1.25 36x6 - - - 9.95 - - - 3.95 32x650-20 - - - - 1.35 36x8 - - - 12.45 - - - 4.25 TRUCK BALLOONS 40x8 --- 15.95 - - - 4,95 Bize Tires Tubes i ee $3.78 oe eh we - 81.65 All Other Truck Sizes .00-20- - - -a 9S - - - - = 25 7.60-20- - - - = €@es ---+-- , 3.75 15020. - >>: S95 ----. 3% | WE WANT DEALERS ALL TUBES ARE GUARANTEED BRAND NEW on each tire. (On each Truck Tire send a $4 deposit.) Send Only $1 Deposit We ship balance C. O. D. 5 per cent discount for full cash with order. Any tire failing to give 12 months’ service replaced at half price. GOODWIN TIRE & RUBBER 60, D pt. 1102, 1840 South Micpa Ave. . anges ILL.

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Read what happened TIl take your train«. _ ing. That’s what S.J. . Ebert said. He has! ` made good money and ` found success, I’m not, intrested.: ` That’s what this. fe : low-said. | Today. he: would be ashamed if I gave you his real mame. +: > g will Train You at Home in Spare Time for a GOOD JOB IN RADIO These two fellows had the same chance, Not long ago they each clipped and sent me a coupon, like the one in this ad. They got my book on Badio’s opportunities. B. J. Ebert, 49-B Quadrangle, University of Iowa, lowa City, lowa, saw that Radlo of- fered him a real chance. He enrolled. The other fellow, whom we will call John Doe, wrote that he wasn’t interested. One of those fellows who wants a better job, better pay, but never does anything about it, One of the many who spend their lives in a low- pay, no-future job, because they haven’t tho ambition, the determination, the action it takes to succeed. Bead what S. J. Ebert wrote me and re- member that John Doe had the same chance: “Upon graduation I accepted a job as service- man, and within three weeks was mado Service Manager. This job paid me $40 to $50 a week compared with $18 I earned in a shoe factory before. Eight months later I went with Station KWCR as operator. From there I went to KTNT, Now I am Radio Engineer with WSUI, I certainly recommend the N.R.I, to all interested in the greatest field of all, Badio.” Get ready for Jobs like these. Many Radio Exports make $40, $60, $75aweek — Spare time and full time set servicing; in- stalling, operating, maintaining broadcast, “T want to help you. If you are earning less than $35 a week I believe I can raise your pay. However, I will let you decide that. Let me show you what I have done for others, what I am prepared to do for you. Get my book, read it over, and de- cide one way or an- other.” J. E. Smith, aviation, commercial, police, ship and tele- vision stations. Good jobs with Radio dealers and jobbers. A service shop or Radio retail business of your own. Pll train you for these and other good jobs in connection with the manufacture, sale and service of Radio sending and receiving sets, auto sets, loud speaker systems, short wave sets, etc. Save Money—Learn at Home. Money Back Agreement Protects You Hold your job. I’ll train you quickly and inexpensively right at home in your spare time to be a Badio Expert. You don’t need a high school or college education, My 50-50 method of training—helf with lessons, half t with Radio equipment—gives you broad prac- tical experience—makes learning at home easy, fascinating, practical. I will agree in writing to refund your money if you are not satisfled with my Lesson and Instruction Service when you finish. Earn $5, $10, $15 a Week In Spare Time That’s what many of my students co scon after enrolling. I'll give you special train- ing, plang and ideas to help you do it. Many students have made $200 to $1,000 in spare time while learning. Nearly every neighborhood offers a spare time serviceman an opportunity to make good money, I'll show you how to “‘cash in’’—show you why my Course is World-Famous as ‘“‘the Courso that pays for itself.” Find Out What Radio Offers You Mail the coupon. My book is free to any ambitious fellow over fifteen years of age. It tells you about Hadio’s spare time and full time job opportunities—about my Course, what I give you, what my students and grad- uates do ard make. There is no obligation. Act today. Mail coupon.in an envelope or paste on a le postal card, Do it right now. J. E. SMITH, President National Radlo Institute, Dept. 4HH Washington, D. C. J. E. SMITH, President, National Radio Institute, Dept. 4 HH, Washington, D. C. > Dear Mr. Smith: Without obligating me, send free book about spare time and full time Radio opportunities and how I can train for them at home. (Please print plainly.) Name ...-.cereeee EETA TEET EEA E E E E EEn ECO ET S ng ue E EE EEEE E EN City ..... PCr eee rer eee ee ee ee) ee ba m m m u m m m m m E Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers w

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PRICE 15 CENTS (20 CENTS IN CANADA) uk wT, AUGUST Volume XII 1934 Number 4

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Gee SPECIAL FEATURES SHORTER FEATURES Exclusive! My Flight Into the Solving Readers’ Problems - 12 Stratosphere - - - - © = 34 : By Jean Piccard Track Barrier Leads Auto Devices - - - + - 56 Boat Building Club Gets Charter in Byrd’s Ice Tunnel Village - 63 Society of Mechanix and Inventors - 39 “Life in Ice” Prize Contest - 66 How a Fireworks Magician Tames Radio Tube Train - - - 68 Dynamite - - - a fe ~ = 40 Needed Inventions - - - 75 By Paul Paddock Repairing Sunken Highways - 78 Riding Motor Broncos to Victory - - 45 | Landing Game Fish With By Joe Petraii, Tempting Lures - - - 86 National Hillclimbing Champion Camp Kinks Simplify Tasks - 88 New Chicago Stockyards to be Fireproof 49 | Fishing Handikinks - - 89 Problems of Staging Championship Fight 50 |. Annared Lawa Gadgeti < 1:725 By Alfred Albelli Keeping Rooms Cool - - 97 z Find Gold With Black Light Powderless Gun Hurls Shells 100 Miles 53 "Box ae a ears na 101 Radio Hunters Seek Pirate Gold - .- 54 Travel Light on Week-en By Leonard Walters Bike Cruises - - - - 108 : Ww ing Top L Are You Fit to Drive an Automobile? - 58 Paar eg. ete By John Co Harper Swimmin’ Hole Teeter-Totter 113 Microscope Opens New Worlds to With the Collectors - - - 114 Pepe 7 C ae r D a 2 - 6l ‘June Contest Winners - - 142 By Aulan De Conringon, nD: New Business Inventions - 146 Will “Black Blizzards” Make U. S. a HOW-TO-BUILD Desert? - = «= = a «= = 64 TO. By James Nevin Miller FEATURES Ships Are Launched With Sand Ty - 70 Scooter Steers With Airplane À By Nic Sprank in Oddities of Science Joystick - - + - - 90 . F: How Carnival Racketeers Fleece the By Weston mee Public z . a i 7 B =- 72 Rel Flying, Bnl With a ša By Earl Chapin aPN Doulas Rolfe- y Douglas Rolfe New Speed Era Dawns by Harnessing Mount a Sail on Your Bike - 103 Diesel Power - - - + + = -80 By Hi Sibley By Robert Faherty Floating Drydock Raises Boats 104 Fight Fire Forty Years to Work Burning By Robert G..Silbar Mine - = = ʻ < a 3 - 85 Colonial Bridge Lamp - - 106 5 By O. E. Olson Sportsmen’s Campfire l 4 . z - 86 Building Body of “Aloha,” By Robert Page Linco Reo Trailer de Luxe—Part II - 110 Hunting and Fishing Editor By Robert W. York (Contents continued on page 6)

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TABLE OF CONTENTS Continued From Page, 5 NEW MECHANICAL INVENTIONS | INTERESTING SCIENTIFIC ITEMS Tiny Motors Made From Iron Pipe - - 37 | French Airmen Span Atlantic - 37 Ash Tray Man Blows Out Cigarettes - - - 37 | Electric Bellows Keeps Man Alive - -° - 38 Trailer Truck Delivers New Cars - - - 38| Huge Bus Carries 150 Passengers -` - - 38 German Invents “Flying Bicycle” - - - 38| Trains Insects for the Movies - - - - 44 Radical Streamlines Feature:1935 Car - - 43 | Cadets Play Baseball on Stilts. - - - - ,52 Vertical “Oars” Propel New Boat - - - 43 | Blacksmith Sets up Shop in Auto - - - 52 Portable Fan Operates by Hand - - - 431 Diver Broadcasts Under Water.. - - -. 60 Burner. Destroys Roadside. Weeds - - - 43 Giant Films Make Photo Mural - - - 60 Braves Sea Perils in Tiny Boat - - - 44| “Asbestos” Man Walks in Furnace = - > : 62 Safety Wheels. Aid Bike Novice ki = iz 44 Car Propels Ferry by Own Power - - - 67 Guards Adopt Rubber Life Floats - - - 48 | Message Girds Globe in 3 Minutes ` - - - 767 Tap Pipe Easily With New “Tee” - - - 48 | Aerial Ferry Carries Automobiles - - - ,68. Aluminum Boat Weighs 30 Pounds - - ~- 48 | German Life Saving Suits - - - - - 71 New Bicycle Built for Two - - - - - 481 Latest Escalators Are Streamlined - -- - 74- €lub-Weight Improves Golf Swing - - - 52| Composers Dream Invents Piano - - - 76. Electric Device Curries Horses - - - - 52] Comic Trolley Houses Birds - - - - 76 New. Inventions for Housewives ` e Adopt aae pane D ag A . ; oller Skate Skis Used Indoors - - - Shee ee Easily Changed RR eee Robot Combines Crooning, Housework - - 79 Door Knob Extension - - - - + 57 Gadgets Create New Form of Art - - - 82 Cooking Thermometer - - - - - 57| Horse’s Bit Is Radio Antenna - - - - 82 Radio Range Finder for Ships - - - . 60 Expert Tastes Soap for a Living - - - 83 Milk to Be Sold in Paper Bottles - - - 62 Compressed Gas for Motor Fuel .- - + 84 Electricity Helps Paralyzed Patient - - - 62 RADIO SPARKS New Kiddie Carrier for Mothers - - - 67 | Good Grounds Improve DX Reception + 93 English Bike Is Built for Three - - - 67| Stopping A.C. Hum with Tinfoil - - ‘93 Outboard Bike Used in Water Polo - - 68 |. Make Wet B Batteries from Storage Battery - 94 p rok ce Build a Heavy Duty Power Supply - - - 94 House Is Builg of Steel Hoops e? Sliding Rod Antenna Stops Static - - - 95 Camera-Gun “Shoots” Pictures - + + 69| Scratch Filter for Phono Pickup - - - 95 Wheel Springs Absorb Auto Bumps - - 69 Winding Filament Transformers - - - 95 Tall Men No Longer Cut Off View -. - 71 | Test Condensers with Light Bulb - - - 95 Robots Guide Transport Planes - e+ 71 Motor Drives New Hedge Clipper - - - 74 FOR THE WORKSHOP FAN Lemon Slicer Cuts Ten Sections - - - 74 | Random Chips from he Editor’s Workbench - 20 : n en «oe, soll JS Tips for the Workshop - - 92 areas Robes Shows Goll Swing 74 Vases from Phonograph Records - - - 97 ectric Ear Finds Car Knocks .- - - - 76 Timely Summer Ideas - - - - - -100 Designs Streamline Train Shell - =- + 77 | Vacationing Handikinks - - - = 102 Novel Device Electrocutes Flies - - 79 ae ee eee faut gal aes, See ae in A we 3-Blade Hacksaw Cuts Grooves -2 A Weeds and Edges Garden 79 Cabinet Photo Printer Is Handy > -. - 108 encil Sharpener Is Automatic - > + 79| Curtain Rod for Drying Films -5. 109 Electric Muffler Warms Driver ~ =- + 82| Fork Smooths Tracing Paper - -..- - 109 New Device Answers Phone - - - - 83 oe Shiter Trips Camera - - - = o “Ch; y y Acid-Proof Wood Trays - - - -109 Auto-Ship Huns on Land or, Water 5 Cellophane Drawings for Lunda Slides - ~ 109 Guards Reduce Motorcycle Injuries - - - 84 Woodpecker Windmill for Lawn - - - H3 Room Cooler Like Chandelier - - = 84| Rustic Log Lamp Ideal for Cabin - > +, 113 William J. Kostka Published monthly by Modern Mechanix Publishing Co., L. B. Robbins Editor 529 So. 7th. St., Minneapolis, Minn., U.S.A. Not respon- National] Known Radio : aha for unsolicited manuscripts. Contributions accompa. Expert : nied by insufficient. postage will not be returned. Entere A. Neely Hall as Sécond Class matter Sept. 20th, 1928, at Minneapolis, S. Ss. Rabl Workshop Expert Minn.. Copyright 1934. Advertising offices Chicago, 919 Naval Architect Nerth Michigan: Ave.; New York, 52 Vanderbilt Ave. Robert Page Lincoln 15: cents a copy; $1.50 a year in Ù. S. and Possessions. Ray F. Kuns Hunting and-Fianing Iri- Canada, 20c a copy; $2.25 a year. Other Postal Principal, Cincinnati Auto- Editor Unions, $2.00 a year. Printed in U.S.A. motive Trade School

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Give me your measure and PII PROVE You Can Have a Body like Mine! NOTE: ° h Te give you PROOF in 7 days that I can O No other turn you, too, into a man of might and P hysical Instructor muscle. Let me prove that I can put layers of in the World has o supple, a muted all over your ever DARED make such an offer! If you are underweight Pll add the pounds where they are needed and, if you are fat in any spots, I'll show you how to pare down to fighting trim. And withthe big musclesand powerful, evenly-developed body that my method so quickly gives you, I’ll also give you through-and-through health—health that digs down into your system and banishes such things as constipation, The 97-lb. weakling who became pimples, skin blotches and the hundred-and-one other twice holder of the title: “The World’s Most Perfectly Developed Man”——won in open-competition in the only national and interna- tional contests held during the past 15 years. ailments that rob you of the good times and the good things of life, £ Here’s All You Do! Just jot down your name and address on the coupon below, mail it to me—and I'll send you, absolutely free, a copy of my new book, “Everlasting Health and Strength.” Tt reveals the secrets that changed me from a 97-pound, fiat-chested weakling into a husky fellow who won the title of The World’s Most Perfectly Developed Man” against all com- ers! And it shows how I can build you into an “Atlas Champion” the same easy way. I haven’t any use for weights or pulleys that may strain your heart and other vital organs. I don’t dose you or doctor you. Dynamic-Tension is all I need. It’s the natural, tested method for developing real men inside and out. It distributes added pounds of powerful muscles over your body, gets rid of surplus fat, and gives you the vitality, strength and pep that win you the admiration of every woman and the respect of any man. CHARLES ATLAS As He Is Today. ‘Gamble a Stamp-—To Prove | Can Make YOU a New Man! pple enlace lye de bed whe vale z CHARLES ATLAS, Dept. 6-H, 133 East 23rd Street, New York City. l I want the proof that your system of Dy- Gamble a stamp today by mailing the coupon for a free copy of my book, ‘Everlasting Health and Strength.” It tells you all about my special Dynamic-Tension method, and what it hag done to make big-muscled men out of run-down speci- mens, It shows you, from actual photos, how I have developed my pupils to the same perfectly balanced proportions of my own physique, by my own secret methods. What my system did for me, and these hundreds of others, it can do for you too. Don’t keep on belng only 25 or 50 per cent of the man you can be! Find out what I can do for you. Where shall I send your copy of “Everlasting Health and Strength”? Write your name and address plainly on the coupon, and mail it today. CHARLES ATLAS, Dept. 6-11, 133 East 23rd Street, New York City. Namic-Tenslon will make a New Man of me— give me a healthy, husky body and big muscle development. Send me your free book, “‘Ever- lasting Health and Strength.” WaMG EEEE E LEETE Lotte eee eee eneee (Please print or write plainly) AdArOSS. ci see cece scree eter na i (0), eee Rarer en cee rere State......-.06 ®© 1934 0.A.Ltd. Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers 7

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NO NEED TO NEGLECT CUTS VOW DRYBAK BAND-AID Protects Small Wounds instantly Always cover cuts, scratches, burns, blisters with Drybak Band-Aid — ad- hesive strip with borated gauze pad attached. Only Drybak Band-Aid has waterproof backing, suntan color. In- dividually wrapped for your protection. At your druggist's. with your name and address printed in margin with 5¢ in coin for packet of Drybak Band-Aids ond pamphlet "First Steps to First Aid”. Address Dept. 955. foinn / «+ Gohmsonn U” New Brunswick O” NewJersey | 500 POWER MICROSCOPE [$3.95 | - @& New 500X Super-Power: Brownscope a The QUALITY microscope satisfying the demand for ultra-high: power at low cost: Magnification can.-be \\ varied from 75X to 500X to suit the parti¢ular require- N ments of the Amateur Microscopist. ALL refine- ments! Rack and pinion precision fecusing with TWO adjusting wheels. Adjustable stand tilting: any.angle, with tightening. lever. Compound: ob- jeetive and: ocular lenses. Large stage. Removable sHde clips. Large adjustable removable: mirror. Substantially and precisely made. Compare- this a ed. Comes complete with preparedand plainsiides, directions. sHde making and dissecting equipment. Only $9.95. (By mall, adt 80c for postage.) F BROWNSCOPE CO. Dept. M-21 246 Fifth Ave. New York \ Rew Brownseope with other microscopes: on- the- = market: Money back In five days if nobthèrvughly: Batisi | Is Radio Comedy Doomed? You’ve listened and laughed at the radio antics of Stoopnagle and Budd, Eddie Can- tor, Ed Wynn, Burns and Allen, Joe Penner, Jack Pearl, Fred Allen, Jimmie Durante—but do you know the amaz- ing new trénds in radio comedy which threaten to affect: the futures of these favorite comedians? They’re on the carpet—to find out what they’re going to do about it, read the revealing article in the big August issue RADIOLAND The News Magazine of the Alr Dozens of other sparkling stories which bring the fascinating world of radio right. to your fireside—a message for Radioland readers from the Byrd Expedition at the South Pole; Singin’ Sam’s Romance; Radio Waves the Red Flag— : the startling facts about shortwave. propagan- da; beautiful portraits of the stars and scores of lively pictures taken behind the scenes by a -eorps of contributors constantly circulating through the network studios. No wonder thousands of fans write us that RADIOLAND is the most fascinating book they’ve found on any news stand! At All Newsstands 10c . Thank You for Mentioning Modern Mechanix and Inventions jor August When Writing to Advertisers

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INTERNATIONAL CORRESPONDENCE SCHOOLS “The Universal University”? Box 2325-X, Scranton, Penna. Without cost or obligation, please send me a copy of your booklet, “Who Wins and Why,” and full particulars about the subject before which I have marked X; TECHNICAL AND INDUSTRIAL COURSES Voovw YOU MARK © Architect D Automobile Mechanic ~ í O Architectural Drafteman O Plumbing O Heating A N D M A | L J T D O Building Estimating O Air Conditioning | O Wood Millworking O Sheet Metal Worker D Contractor and Builder O Steam Engineer OD Structural Draftsman O Steam Electric Engineer O Structural Engineer Q Civil Engineer O Electrical Engineer O Surveying and Mapping D Electric Lighting O Refrigeration O Welding, Electric and Gas OR. R. Locomotives Ò Air Brakes Seed pit oe | D E- R Beiioa Foma anaa | l elegraph Engineer . R. Bridge-anç ing Foreman § in H O Telephone Work OR, R. Signalman 7: F # O Mechanical Engineer O Highway Engineering But we don t tell you that 5 H Mechanica! Parag B Chemistry Ea O Pharmacy y achinis' ‘oolmaker oal Mining Enginee: O Inventing and Patenting O Navigation L Boilermaker it S n ot tr Ue. Too m u c h E Tatterimaker Etak a Tatile Overseer or Supt. á H eat Treatment o! eta ‘otton Manufacturing H O Bridge Engineer O Woolen Manufacturing depends on you } © Bridge and Building Foreman O Agriculture O Fruit Growing 4 | Gas-EnginesQ] Diesel Engines O Poultry Farming O Radio H O Aviation Engines O Marine Engineer a Ji | BUSINESS TRAINING COURSES WE Do say this — and can prove ‘it: | © Business Management O Business Correspondence y | O Office Management © Lettering Show Carda Signs Thousands of men all over the a pnduserial Management a Btenography and Typing S raffic Managemen ivil Service E Acgountaney and Mail Cartier oyy country today are making $50 a .P.A, Coaching way Mail Cler] oe D Bookkeeping D Grade School Subjecta week and over, and are emphatic in. g Secretarial Worle n High Sohal Subjects I cti h d rani 03) ountant ollege Preparatory -| 5 Salesmazehip 5 Adve rising D Firat ook otiaen a the conviction ome study training i tation esmanship ustrating i 2 E Wallpaper Decorating D Cartooning £l Freach through I. C. S. Courses is the great- Salesmanship O Lumber Dealer est single factor in shaping their careers! If you have just a vague wish for more money, don’t trouble yourself or us with the coupon. But if you mean business, so do we! P EtL EP EPA N P City... NEA ON AIOE ~- OE EEE svosore Oeit Wond vesee sands eT If yon reside in "Canada, “kend. ‘this, coupon to the “International Correspondence Schools Canadian, Limited, Montreal, Canada Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers 9

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“DOUBLE - QUICK” REDUCTION DURING THE SUMMER |"! TEST the ~ WEIL BELT” For 10 Days at our expense! “ep OST 50 pounds,” says W. T. Anderson. ... “My waist. is 8 inches smaller,” writes W. L. McGinnis. .. . “Felt like a new man” claims Fred Wolf... . “Wouldn’t sell my belt for $100,” writes C. W. Higbee. So many: wearers are delighted. with the results obtained with the Weil. Belt that we want you to test it for ten days at our expense! Greatly Improves Your Appearance! @ The Weil Reducing Belt will make you appear many inches slimmer at once, and in 10 short days your waist: line will actually be 3 inches small- er—3 inches of fat gone—or it won’t cost you one cent! e@ It supports the sagging muscles of the abdomen and quickly gives an erect, athletic carriage. @ Don’t be embarrassed any longer with that ‘‘corporation” for in ashort time, only the admiring comments of your friends will remind you that you once had a bulging waistline. The Massage-Like Action Does It! @ You will be completely comfort- able and entirely unaware that its gentle pressure is working constent- ly while you walk, work or sit... its Mnassage-like action gently but persistently eliminating fat with every Move you make! @ Many enthusiaslic wearers write that the Weil Belt not only reduces fat but it also supports the abdom- inal walls and keeps the digestive orgens in place—that they are no longer fatlgued—and that it great- ly increases their endurance and vigor! Don’t Wait—Fat Is Dangerous! @ Fat is not only unbecoming, but it also endangers your health. In- surance companies know the danger of fat accumulations, The best medi- cal authorities warn against obesity, so don’t wait any longer. @ We repeat—either you take off 3 inches of fat in ten days, or it won't cast you one penny! NO- DRUGS, Dil OR EXERCISES Oe SUPPORTS FALLE ABDOMINAL “MUSCLES © Your Waist Bday (© aed money refunded ND-FOR FREE 10 DAY TR THE WEIL COMPANY, INC. 398 HHI St., New Haven, Conn. Gentlemen: Send me FREE, your illus- trated folder describing The Weil Belt _ and full details of your 10 DAY FREE TRIAL OFFER. Name Address City State Use Coupon-or. Sénd Name and Address on penny oosttard.' NEW INVENTION S Smas SAVES GAS Cuts Gasoline Costs pity as much as 30%—Fully Automatic Here's what every car needs! The new Vacu-matic —"The Carburetor Control That Breathes!” Func- tioning directly with the manifold vacuum, it automatically provides correct combustion and peak performance under all driving conditions. With it you get more power, more speed, quicker get-away, less carbon and smoother running. AGENTS FITS ALL CARS Vacu-matie is a 6 piece electrically Make up to $15- welded unit, factory regulated and $20:a day; fall sealed. Can be installed in a few minutes. Gas savings guaranteed. FREE TRIAL OFFER Don’t wait! Just send your name and address for full information and details of our FREE OFFER! VACU-MATIC CO., 7617-38 W. State St., Wauwatosa, Wis. ANY PHOTO ENLARGE Size 8210 Inches or smaller if de- = sired, Same price for full length or bust form, groups, landscapes, pet (H animals, ett., or enlargements ofany or spare: time. Exclusive terri- tortes. Write quick for full particulars. part o! group picture. Safe return of original photo guaranteed. SEND NO MONEY loste photo or snapshot (any size) and within a week you will receive your utiful life-like enlargement, guaranteed Jedelese. ‘ay Dost man 470 plus postage—or send 490 with order and we pay postage. Bi 16226-Inch enlargement sent C. O. D, 78 plus ge or Bent B0o and we pay postage, Take advantage of this amazing offer now. Bend your photos today. ‘Speally size wanted, ~ STANDARD ART STUDIOS, 104 S. Jefferson St. Dent. 374K, Chicazo 22,703 STOP TOBACCO? Banish the craving for tobacco ag thousandshave. Makeyourself free and happy with ‘Tobacco Redeemer. Not asubstitute, not habit forming. Write for free booklet of in jurious effect of tobacco and depend- able, easy way torelievethe Į craving many men have FREE J { >) Newell Pharmacat Co. I ROOKI- . a Dept. 700, St. Louis, Mo. yd Build ONLY Simple and fascinating. Hundreds of Experiments. all practical men, tinkerers, boys, ete. Requires about 40c to build. Plans sent for only 25e coln. ALBERS RESEARCH LABORATORY 3834 Humphrey Street St. Louls, Mo. HAENEL “100 SHOT” REPEATER j A Latest Model 1934 Haenel repeating plstol. Sturdy, massive construction, easy cocking lever, 100 shot magazine. For target. Powerful for. small game. Bhie or Nickel finish, shoots B.B. steel shot. Weight 18 oz. Free—500 shots, —$2.00 deposit on. C. O. D. Free Catalog— Colts, S. & W. Rifles, Binoculars. cte. HUDSON SPORTING GO_WS ~uUMPANY M-52 Warren Street New Yo A NHELP WANTED! WHOLESALE CATALOG To introduce our line of 2000 Super quality items, such as: Cosmetics, food- flavors, hosiery, fountain pens,. office supplies, kitchen necessities, deals of _all kinds, carded merchandise, neck~ ‘laces and many others. SEND FOR FREE WHOLESALE CATALOG SPORS CO. 594 Fawcett St. Le Center, Minn. 10 Thank You for Mentioning Modern Mechanix and Inuentions for August When Writing to Advertisers

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Eve ry Good Boy Dese Fun LOOK! Easy as A-B-C rves to learn music this way : UST see how easy it is! The lines are always E-G-B-D-F. Memorize the sentence, “Every Good Boy Deserves Fun” — and there you are! Whenever a note appears on the first line, you know it is e. Whenever a note appears on the second line, you knowitis g. And the spaces—just as easy to re- member. The four spaces are always F-A-€-E. That spells ‘‘face’’—simple enough to remember, isn’t it? Thus whenever a note appears in the first space, it is f. Whenever a note appears in the second space, it is a. You have learned something already! Isn’t it fun? You'll just love learning music this fascinating way! No long hours of tedious practice. No dull and uninteresting scales. No “tricks” or “secrets’—no theories—you learn to play real music from real notes, You don’t need a private teacher this pleasant way. In your own home, alone, without interruption or embarrassment, you study this fascinating, easy method of. playing. Practice as much or as little as you hke, to suit your own conven- jence, and enjoy every minute of it. Choose Your Course You learn from the . Start—Previous training un- necessary So clear and simple are- Plano Organ Ukulele Cornet Trombone Piccolo Gultar The surest way to popularity Don’t be just “another one of the guests” at the next party you go to. Be the center of attraction! The most popu- lar one at a party is always the person who can entertain—and there js no finer and more enjoyable kind of entertain- ment than music. Never before have you had such a chance to become a good player—quick- ly—without a teacher. And this method does not mean that you will be able merely to read notes and play a. simple tune or two—but it means you will be- come a capable: and efficient player. Many of. our pupils new | have positions with. pro- | fessional bands and or- Violin chestras. Clarinet Flute Saxophone - Harp Mandolin *Cello | No alibis now for not learning to play your favorite these fascinating ‘‘music- lessons” that even a child can understand them. You do not lose-a minute with unnecessary details—only the most es- sential principles are taught. Clear, concise, in- teresting and. attractive ——that is how each lesson is presented to you. And at an average- cost of- only a few pennies a day! Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers Voice and Speech Culture Hawaiian Steel Guitar Trumpet Sight Singing Harmony and Compos Hion Drums and Traps Automati Finger Control. Banjo (Plectrum, 5- String or Tenery Piano Accordion itatlanand German Aocordien- Juniors’ Plane- Course instrument Like having a phantom i teacher at your side- ev- t ery minute, encouraging you, teaching you, -smoothing the way, so . that: it becomes so much easier, so much quicker - for you to master your ` favorite musical instru- | ment. You simply cannot go wrong. First you are told how a-thing is done, then. by graphic illustrations and diagrams you are shown how, and when you play—you hear: it. Don’t be afraid to begin your lessons at once, Over 700,000 people learned to play- this modern way—and found ‘it as easy as A-B-C. Forget that old-fash- ioned idea that you need special ‘‘tal- ent.” Just read the list of instruments in the panel, decide which one you want to play, and the U. S. School will do the rest. Send for our free book and demonstration lesson Our wonderful illustrated Free Book and our Free Demonstration Lesson-ex- plain all about this remarkable method. They prove just how anyone can learn to play his favorite instrument by note in almost no time and for just a frac- tion of what old, slow methods cost. ‘The booklet will also tell you all about the amazing new Automatic Finger Control. Act NOW. Clip and mail this coupon today, and the fascinating Free Book and Free Demonstration Lesson will be sent to you at once. No obligation.. U: S. School of Music, 2628 Brunswick Bldg., New York City. Thirty-Sixth Year (Established 1898) SER ee ee eee ee ee es en en es es r U. S. School of Music, 2628 Brunswick Bldg., New York City Please send me your free: book, “How You Can Master Music in Your Own Home,” with inspiring message by Dr. Trank Crane, Free Demonstration Lesson and particulars. of your easy payment plan, I am interested in the following course. Have You dagger ETT EET Instrument? ........ NADIE EE ETT IT A PPE T ET ‘ MG E L A ET gihunece nase suas . Clty sessoasososeosserses iet State.......e

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Is your own problem answered by ADDING SPEAKER TO RADIO How can a magnetic speaker be hooked up to a radio using a dynamic speaker? —C. H. H., Milwaukee, Wisconsin. Connect the magnetic speaker across the primary of the output transformer, rather than in series with the secondary and the voice coil. The power passing through the voice coil is not sufficient to operate a magnetic speaker. * w% * A FUEL-LESS DIESEL ENGINE? Here is a problem that may interest M-M read- ers. Suppose that, instead of injecting a fuel charge into the heated, compressed air inside a Diesel engine cylinder we inject water. This water, striking the hot air, is instantly changed into dry steam. Will the resulting pressure operate the engine? —A.M.C., Port Angeles, Wash. Since there is no disintegration of the water in the above case, water is not the fuel. We then have an engine running with- out fuel—a perpetual motion machine. This has been proved impossible of achievement. Therefore, the Diesel engine will not run on water. * * * HOT DAYS IN ARCTIC REGIONS Why do scientists say that on December 22 the South Polat region is the hottest part of the earth? —W, L., Wittman, Md. On this date the South Pole is closer to the sun than any other part of the earth. It would actually be the hottest part if it were not for the huge masses of ice which absorb the heat of the sun’s rays. kod * * ADJUSTING THE “DYNAMIC DIADEM” Referring to the “Dynamic Diadem” store win- dow display in the April, 1934, M-M, what is the correct pitch for the various mirrors?—N. S., Billings, Mont. ; With the “Dynamic Diadem” stationary, adjust each mirror until you can see at Teast one of the reflections of the light bulbs when standing directly in front. 12 one of these M-M reader letters? ‘CASTING LEAD IN PLASTER MOLDS I tried to make lead castings for my model sailboat with plaster of Paris molds, but the lead boils and spatters violently as soon as it is poured in.—H. S., Long Island, N. Y. The plaster of Paris molds must first be thoroughly dried. A medium hot oven will hasten the drying. Then give the molds several coats of shellac to stop absorption. Oil the molds or coat with powdered graph- ite before pouring the metal. Pewter, anti- mony, 50-50 solder or type lead are satis- factory for small castings. $ * w PLANKING FOR SMALL BOATS If I fasten the planking of my boat as close together as possible, will the boards warp when the boat is placed in the water?—J. R. S., St. Louis, Mo. The edges of boat planking thicker than 4%” should be beveled so that planks are touching on the inside edges only. The out- side cracks are then filled with regular caulking material. * * kd A $148 AIRPLANE Are there any airplanes being manufactured today in the United States to sell for less than $500 complete?—J. V. C., Portland, Ore. A Texas aircraft company is now putting on the market a monoplane which sells complete with 40 h.p. motor for less than $150. Although the ship is flight tested, it is being sold as a ground training ship to eliminate stress analysis expense and avoid any legal technicalities. The cruising speed is 55 m.p.h., and the landing speed 25 m.p.h. * * * RADIO TRANSMITTER BLUEPRINTS Have you any blueprints for a simple radio transmitter and receiver combined that can be used for code communication up to 20 miles? —H. P. J., Phillips, Wisc. Blueprint plans for the Rabl Radio, a one tube combined transmitter and receiver, are available here at 25c postpaid. (Editor's Note—All letters sent to this department should include a stamped addressed envelope. Write to M-M Problems Editor, 529 So. 7th St., Minneapolis, Minn.)

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Fw Y © ] : © i Jos START 1260 to $2100 a YEAR Many U. S. Government Jobs Open to Men and Boys 18 to 50 Railway Postal Clerks—Post Office Clerks—City Mail Carriers—Rural Mail Carriers—General Office Clerks—Liquor Gaugers—Storeskeepers—Customs Inspectors—Immigrant Inspectors A VERY DESIRABLE POSITION Railway Postal Clerks get $1900 the first year regular, being paid on the first and fifteenth of each month, $79.16 each pay day. In normal years their pay is increased $100 and $150 a year. The maximum is $2700 a year, $112.50 each pay day. They get extra allowance for hotel expenses when away from ‘home. PAID VACATIONS Railway Postal Clerks, like all Government employees, are given a yearly vacation of 15 working days (about 18 days). When on long runs they usually work 3 days and. have 3 days off duty or in the same proportion. During this off time and vacation, their pay continues just as though they were working. When they grow old, they are retired with a pension. As Railway Postal Clerks are continually traveling, they have an excellent chance to see the country. They are furnished with a railroad pass for official business. City Mail Carriers—Post Office Clerks = ___ Clerks and Carriers get $1700 the first year regular and HA in. normat years automatically increase $100 a year to P FRANKLIN $2100, with further Increase to $2300. They also hare 7 INSTITUTE 15 days’ vaeation. Pa Dept. E-298 What Will You Earn 47, ROCHESTER, 'N. Y. . Rush to me free of charge (1) a 2 ? 5 Years From Now? or” full description of the position checked DO: YOU: EARN $1900 EVERY s below; (2) Free copy of 32-page illus- YEAR? HAVE YOU ANY. AS- o trated book, “How to Get a United States SURANCE THAT” A FEW Re) ai Government Job”; (3) A list of United States YEARS FROM Now You cO™ Government. Jobs. WILL. GET $2700 OR vu [_} Railway Postal .Clerk (Start, $1,900) MORE A` YEAR; p { J Post Office Clerk (Start, $1:700) Start, $1,700) EVERY YE. [.. ] City. Maik Carrier .. i ABE eo [ _ } Btenographer-Typist - (Start, $1,260) : 7 = Pi A t } Liquor Gauger—Storeskeeper LLII (Start, $2,000) ~ Get FREE: List of Positions i a [ J Customs Inspector ......... ccc ccc es eee e ree ceee (Start, $2,100) “SFL out the coupon. Tear it off and mail it today f| ` Pa Name now, at ‘once. DO IT NOW —This investment OMCs es eretia ETTE ETET PES ETE bearers Nitiacos ahs g =for-a postage stamp may result in your getting la Mfe U. S. Government Job. OO . BEAU OCSS AIEE Soke ee EIEN E EEEE glee delat ede dae ud Use This Coupon Before You Mislay It—Write or Print Plainly. Thank You for Mentioning Modern Mechanix and Inventions jor August When Writing to Advertisers 13

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Posed by professional models Special WAY TO PUT POUNDS ON FAST! Astonishing gains with new double tonic. Richest imported brewers’ ale yeast now concentrated 7 times and combined with iron. Gives 5 to 15 lbs. in a few weeks OW there’s noneed tohave people calling you “skinny”, and losingall your chances of mak- ing friends. Here’s a new, easy treatment thatis giving thousands solid flesh—in justafew weeks. As you know, doctors for years have prescribed yeast to build up health for rundown men and women. But now with this new discovery you can get far greater tonic results than with ordinary yeast—regain health, and in addition put on pounds of solid flesh—and in a far shorter time. Not only are thousands quickly gaining good-looking pounds, but also clear, radiant skin, new strength and pep. Concentrated 7 times This amazing new product, Ironized Yeast, is made from specially cultured brewers’ ale yeast imported from Europe —the richest yeast known-—which by a new process is con- centrated 7 times—meade 7 times more powerful. But that is not all! This marvelous health-building yeast is then ironized with 3 kinds of strengthening iron. Day after day, as you take Ironized Yeast, watch flat chest develop and skinny limbs round out attractively. Skin clears, new health comes—you’re a new person. Results guaranteed No matter how skinny and weak you may be, this marvel. ous new Ironized Yeast should build you up in a fewshort weeks as it has thousands. If you are not delighted with the results of the very first package, money back instantly. Special FREE offer! To start you building up your health right away, we make this absolutely FREE offer. Purchase a package of Ironized Yeast at once, cut out the seal on the box and mail it to us with a clipping of this paragraph. We will send you a fasci- nating new book on health, “New Facts About Your Body”, by a well-known authority. Remember, results are guaran- teed with the very first package—or money refunded. All druggists. Ironized Yeast Co., Inc., Dept. 568, Atlanta, Ga, 14 Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers

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You hear it on all sides, this eternal demand for money. The butcher, the baker, the candlestick maker—money, money, money! ` l When the bills pour in and you stack them alongside your pay envelope—honestly, don’t you have a sense of futility? Don’t you wish you had a job that paid more money? Well, the only way to get that job is to fit yourself for it—to acquire training that you can convert into cash. ; a And you can do it! Thousands have done it. They have found the answer to their problems in spare-time study of International Correspon- dence Schools Courses. Perhaps modern train- ing is the thing you need most. This coupon will bring you complete information—free. INTERNATIONAL CORRESPONDENCE SCHOOLS “The Universal University” BOX 2316-Y, SCRANTON, PENNA. * Without cost or obligation, please send me a copy of your booklet, “Who Wins * and Why,” and full particulars about the subject before which I have marked X: TECHNICAL AND INDUSTRIAL COURSES D Architect D Architectural Draftaman QO Building Estimating O Wood Millworking D Contractor and Builder O Structural Draftsman D Structural’ Engineer © Inventing and Patenting O Electr! Engineer D Eleetric Lighting OD Welding, Electric and Gos D Reading Shop Blucprints O Business Management D Office Management O Industrial Management. Ù Traffic Management D Accountancy DO Cost Accountant .- O Spanish D Telegraph Engineer OG Telephone Work O Mechanieal -Engineer D Mechanical Draftsman D Machinist. O Toolmaker D Patternmaker D-Heat Treatment of Metals O Bridge Engineer O Bridge and: Building Foreman O Gas Engines : O Diesel Enginca O Aviation Engines - © Automobile Mechanic O Plumbing O Steam Fitting D Heating D Ventilation D Sheet Metal Worker D Steam Engineer Q Steam Electric. Engineer O Civil Engincer O Surveying and Mapping D. Refrigeration OR. R. Locomotives OR. R. Section Foreman OR. R: Bridge and Building Foreman BUSINESS TRAINING COURSES OC: P. Accountant O Bookkeeping O Secretarial Work O French D Salesmanship D Advertising E Service Station Salesmansbip D First Year College G Business Correspondence G Lettering Show Cards D Signe D Stenography and Typing O Civil Service D Mail Carrier O Air Brakes [D R. R. Signalman O Highway Engineering O Chemistry O Pharmacy O Coal Mining Engineer O Navigation [ Air Conditioning O Boilermaker O Textile Overseer or Supt. O Cotton Manufacturing O Woolen Manufacturing D Agriculture C) Fruit Growing D Poultry Farming O Radio D Marine Engineer O Railway Mail Clerk O Grade School Subjecte O High School Subjecta DO College Preparatory D Muestrating ` D Cartooning Ad dresS..cssseressesarsveversoseacssoeen R EEEE D „Occupation. If. you -reside in Canada, - sendthis coupon to. the. International Correspondence Schools Canadien, Limited, Montreal, Oanada Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers

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OME of the world’s most suc- cessful inventions came from men who didn’t consider them- selves inventors at all. The tele- graph was invented by a painter; - the typewriter by a farmer; a poet fig- ured out the sewing machine; a school teacher the telephone; a bank clerk the hand camera and a dentist the stock ticker. Or look at small inventions: A husband noticed his wife bending a hair pin to make it stay in her hair. That gave him the idea of the crinkly hair pin, which he proceeded to patent. One day a golfer got the idea—just a hunch —to make a wooden tee. He patented his idea—and every golfer knows that wooden tees are sold by the millions every year. These are but a few of many similar examples in inventive history. That is why we say that the book shown on the next page is for INVENTORS and Other Men with IDEAS. Some men make a business of invention. They make their living—even fortunes—that way. Other men who are not inventors at all occasionally have good, practical inventions which could be patented to their profit and with benefit to the world. Whether you consider yourself an in- ventor or not—if you have a good inven- tion; an invention that will save money, save time, save labor, make money or give pleasure—you should at least find out how you can protect your rights to it. And this interesting, new FREE book, PATENT PROTECTION, will tell you. Many Little Every year thousands of patented new ar- ticles are brought on the market—the result of someone’s happy thought. Often it is these little, simple inventions—the kind you find Read What C. F. KETTERING Vice-Pres. General Motors says about Invention Sometimes we hear people say: “Well, there isn’t much left to invent.” But Charles F. Kettering, Vice President and Head of Research of General Mo- tors, who helped develop the self-starter, Duco, and many other outstanding in- ventions, doesn’t think that at all. He thinks just the opposite. In an inter- view published in Good Housekeeping Magazine, Mr. Kettering said: “If we took half the men employed in tool making and put them to work- ` ing out new inventions, new things, we could snap out of this depression in no time. Our return to normal times de- pends on new manufactured products that will catch the purthaser’s eye, get him to buy and thus start the ball roll- ing. Change and buying go together. We're only entering the great period of inventive advancement.” Ideas Have Big on the counters of a 10c store like the one shown here—that are among the most suc- cessful financially. Whether your invention is simple or complex—large or small—if it is Our Busineis Is To Help Inventors For thirty-five years, this organiza- tion has been in the business of helping inventors. During that time ideas—in- ventions—from literally every corner of the country have been turned over to us to protect. Some of these ideas have represented large and complicated mechanisms; many others have been very small, practical articles, like a can opener or a new toy. All this has given us a wealth of ex- perience which we place at the use of the inventor of today. What you write us is held in strictest confidence. Here in Washington, near the U. S. Patent Office, we maintain a large staff of ex- perienced Patent Specialists, Draftsmen and Specification Writers to give you prompt and competent service. Yet be- cause we know how to work efficiently — our fees are low; and if desired-we are in position to help you with a plan of deferred payments. Delays May Be Costly— Write Us Today In inventive matters, delays can often prove very costly, It frequently happens that two or more inventors will be working on substantially the same invention without each other’s knowl- edge. And the Patent Office rules place the burden of proof on the man who gets his Patent Application on file Iast. So if you have an idea —YOUR VERY FIRST STEP is to find out exactly what to do to protect yourself. That is a step you can take today—right away in fact —by sending for your copy of PATENT PROTECTION. Commercial Possibilities new and useful, you owe it to yourself to find out how you can protect it. Send for a FRE’ copy of the book, ‘Patent Protection,” NOW. VICTOR J. EVANS €C 16 Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers

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` > Hew the Patent Laws protect you and why, if - you have a good inven- ‘tion, you need a Patent at all. What to do to make application for a Pat- ent; just what infora- tiòn`a' ‘Patent’ Attorney neéds to help you. What kind of a sketch or model is needed, What simple ‘steps you may .be able to take right away to help claim. your right to your invention,: even . before roomake-! application x Patent.’ ‘How some successful inveritors have. secured finaticial ‘assistance to ‘them’ in the de- velopment of their in- ventions. I gyense Tells you about in- teresting inventions that have proved successful and illustrates - impor- tant mechanical princi- ples that inventors’ fre- quently use in working out problems. PATENT PROTEC. TION is much more than a book about pat- ent procedure. In it we have put the kind of in- formation that we know from long experience the average man with an invention would like to have. The very same day we hear from you—a free copy of PATENT PROTECTION will be placed in the: mail to you. Sign and send the coupen. Get that much done today. Have VICTOR J. EVANS & CO., MAIN OFFICE: 605-J, VICTOR BUILDING, D. C. WASHINGTON, IMPORTANT With this interesting book, you will also find an ”Evl- dence of Invention’ form, which makes it easy for youto sketch and describe your-idea as a matter of record. This is an important step if you haven’t taken it already. The book will tell you how to use this record and why. It also comes to you without any charge or obligation, the — this Coupon i in MAIL to WASHINGTON er S Other Offices: 1640:J, Conway Building, Chicago; 1007-J, Woolworth Building, New York; 514-J, Empire Building, Pittsburgh; 1010-J, Hobart Building, San Francisco. I am interested in your book, PATENT PROTECTION and your “Evidence of Invention” form. Please send both of them FREE and without obligation on my part. Name Street arid ING: mindoni an E E T E E ea G Cityor TRO WAG Hinsieieud E EAE TEA TA State (Be Sure to Write or Print Name Carefully} 605 J-VICTOR BLDG., WASH. D. C. Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers, 17

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EMPLOYES ONLY!

EMPLOYES ONLY and Yet Ambitious Men Are Getting In! The Question Is: “Are YOU Ambitious?”’ ON’T stand outside that gate and envy the men who are in the midst of the romance, adventure, fascination and good pay of Avia- tion! YOU DON’T HAVE TO. For right in your own home, in your spare time, I’ll give. you the training you need to get started in this fast- growing, well-paid industry. Send today for my free book. It tells all the facts. PLL TRAIN YOU AT HOME QUICKLY—IN SPARE TIME What branch of Aviation appeals to WALTER HINTON was first man to pilot a plane across the Atlantic, first to fly from North to South America, first to use a plane in exploration work, He is ready to prepare you at home in spare time for a good job in Avtation. in Aviation. Many of my graduates have been able to get into good ground jobs paying $40, $60, $75 a week. Others, with the additional low-cost flying instruction I arrange for, have become pilots at $300 a month or better. Send for my FREE book now and get the FACTS. AVIATION IS GROWING FAST Get in on the ground floor of thls amaz- ing industry. Aviation is growing fast— and it is stlll a young industry. Its big development is still ahead. Start NOW to CASI IN on Aviation’s big future, Get on <Aviation’s Payroll soon. My Course will give you the training you you? Whether it’s flying, or a job on the ground, plenty of places will be open to the right men—the trained men, The question is—ARE YOU AMBITIOUS? Opportunities are actually made for the 3 young men who are willing to train for them. I am offering you

Made the chance to get out of a low-pay District rut and enter a big, fast-growing Traffic industry with a tremendous future A Agent —AVIATION. MANY MAKE $40, $60, $75 “When `I finished your A WEEK course I became connecte k J with -T.A.T., and am Yes, sir. Through the simple, prac- happy to state that pro- tical method I have worked out, I moi “has, come, yery can train you at home, in your grateful to you ‘for your spare Pme to fl many good-pay jobs interest and cooperation.’’ Tl. ere are over it- —C. E. McCollum, ferent types of jobs to choose from = ee ee ee ee ‘U WALTER HINTON, President l Aviation Institute of U. S. A., Inc. 1115 Connecticut Ave., Washington, D. C. Please send me a FREE copy of your book, “Wings of Opportunity.” I want to know more about my oppor- I tunities in Commercial Aviation, and your tested method of home training. This request does not obligate me. i Name.....-.--e0:eee saina ant seit sei aes sisia Address..... l (Print clearly) CH E E E N E A sinicnsemnedgp: « BIAG orario der

need to get through that gate up there quickly. The lessons are easy to understand—hundreds of photos, charts and diagrams make everything clear. It’s a practical, success- proved course, In it I’ve packed the knowledge gained from 16 years of practical experience and over 400,000 miles of fiying. Act Now—Get My Free Book Send now for my FREE Book explaining everything. It tells about the oppor- tunities in Aviation, It tells what my training will do for you.’ It tells about my money back agreement and free em- ployment service. It tells what many of my graduates are doing -and making. Fill in the coupon and mail it TODAY! WALTER HINTON, Pres. Aviation Institute of U. S. A., Ino.. (115 Connecticut Avenue Washington, D. C. 822-V $75 a Week as Instructor

Robt. N. Dobbins, a Hin- ton graduate, writes: “I cannot thank. you enough for the assistance you gave me in getting my Present position, Last week they promoted me to Chief Instructor, at a big salary increase.”

eee ee eee eee ee ee eee Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers 19

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RANDOM CHIPS from the Here our readers tell what they are doing. This month’s stack of letters reveals bey, just 14, who flies, explores under water and speeds over ice with MM projects. Chicago, Ill. Dear Editor: Herewith are two snapshot views of the short wave adapter that was in your March, 1933, issue. i The first station brought in was an amateur in Columbus, Ohio, without any antenna on my six-tube midget set. Fhis was my first attempt at building a short wave set. Stanley C. Mosher. * ok š MM’s Radio Sparks helped A. E. McDonell, of Spokane, Wash., build station W7BRG, shown above, and win first prize in radio pheto con- iest. ADIO “hams” swamped the Workbench with photos of their outfits for the radio picture contest announced in the May issue. Acter hours of careful selection and elimi- nation, the judges found two which were considered the best. , First prize of $5.00 was awarded to A. E. McDonell, of Spokane, Wash. His amateur station, W7BRG, is jammed with kinks and ‘sets from MM’s Radio Sparks department. McDonell says: Dear Editor: Spokane, Wash. Here’s a picture of rny set up. Some of the ideas I got out of ycur magazine. I had to take two shots to get all the station. A. E. McDonell. kad $ * Size of outfits did not influence the deci- sions of judges: That is the reason second prize of $3.00 was awarded for photes of a short wave adapter. Stanley C. Mosher, of Chicago, won the prize with a police call box described in the March, 1933, issue of MODERN MECHANIX AND INVENTIONS. Here’s part of Mosher’s letter: | This midget car has a one-horse motor and will do 24 miles per. J. B. Handy offers to give MM readers details. 20 The station walls are decorated with more than 700 QSL cards. For an indefinite period the Workbench will award three prizes for the three best photos published in these columns each month. This monthly contest is open to all readers. Photographs of anything you have built are eligible. All you have to do is snap a picture and send a print to the Workbench. Don’t for- get to send a brief letter along. The more in- teresting the letter, the better chanée you will have. Each contest will close on the fifteenth of the month of the issue of the maga- zine. That is, the contest for this is- sue will close Aug- ust 15. Entries re- ceived after that, however, will not be thrown out, but will be judged in the next month’s contest. First prize is $5, and $3 will be awarded to the second best photo submitted, while the third prize is $2. Send all photographs to The Editor’s Workbench, Modern Mechanix and Inven- tions, 529 S. 7th St., Minneapolis, Minn. All photographs submitted are the property of Modern Mechanix for use in these columns. * $ 7 ok 2 Stanley C. Mosher’s photos of his police call box won second prize in radio photo contest. And here’s a young man, just 14 years old, who flies through the air, speeds over ice, and explores under water. He knows how to use a hammer and a few other tools and found interesting things to build in MM. But let him tell the story: Modern Mechanix and

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Editors WORKBENCH $10.00 IN PRIZES EACH MONTH FOR PICTURES. Read details, then send your photo to the Workbench. Here are the Radio Contest winners. Clearfield, Pa. Dear Editor: A faithful reader of MM I am and I haven’t missed a flying manual since 1930. That’s where I got the plans from which I built the glider. Remember that Northrop training ship? (We do. It’s in the 1930 Manual.) A good landing gear and a small cut down in size are all the changes she got. That iceboat in the picture is the one pub- lished by MM plus the usual change. This time it’s the sail. She folds up for transpor- tation. i The diving helmet is of my own design, Although I am only 14 years old I can travel on ice, under water and through the air and my next will probably be a midget car, ` Walter Schaefer. There is no doubt about Walter being a real boy. Here’s hoping for more pictures from Walter and other boys like him. * + * , Another of our readers offers to help any one wanting to build midget cars. Now is the time for the “auto babies.” If you are interested, glance over. this letter: P. O. Box 737 Lynchburg, Va. Dear Editor: And still another midget car, although this one is big enough to be of some good. It’s weight is exactly 200 pounds and it will carry more than its weight up a 15 per cent grade. Tis powered by a one-horse Nelson Jumbo motor; the rear axle runs on ball bearings and is mounted on rubber; the clutch should look familiar; the brake is external contracting and is actuated by the same lever. Here is Dean Pittenger’s quarter size version of Doane’s Hydrobout. He had five months of fun building the model. Inventions for August Walter Schaefer (hidden under diving helmet) has had more adventures than many older men with his glider, ice boat and diving outfit. He followed MM plans to build them. t The cost was plenty. However, the speed e is 24 miles per on level and ’tis strong enough for two youngsters of 120 Ibs. each to go all over town in together. I will be glad to give detail information to any one upon request. Although an industrial engineer, and so receiving at my desk dozens of magazines, yours brings the most pleasure in my spare hours. ` J. B. Handy. In writing to Handy, don’t forget that stamped, addressed envelope for reply and that reminds us that some of you slip up on . this point when sending inquiries to MM’s many departments. i * k x% Dean Pittenger has found a novel use for How to Build Twenty Boats. Instead of building the full size boat, Pittinger care- fully builds a scale model. This is what he says about the little boat pictured this month: Los Angeles, Calif. Dear Editor: There she is. Five months of a lot of fun. A one-quarter size version of Doane’s Hydro- bout. She is built exactly to scale. Spruce frames, mahogany planking and put together with screws throughout. The engine is one-cylinder, 4-cycle made by a friend of mine. Its his own design. She goes about 10 to 12 miles an hour with door bell batteries fo rthe spark coil. I will be glad to answer any questions re- garding either boat or engine. Dean Pittenger. 21

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AIR CONDITIONING THE NEXT BIG INDUSTRY Its opportunities are as big in winter as in summer. Plumb- ing and heating engineers must know Air Conditioning the field in its broader as- pects invites ambitious men. Write fer information on the new, up-to-the-minute course on Air Conditioning now bi- fered by the International, Correspondence Schools -.- INVENTION—a field of opportunity for men with ideas If yeu have an inventive turn of mind, this new International Correspondence Schools. Course in inventing and pat- enting. will teach you all the basic knowledge you must have in order to- eam real money from your talents. The coupon will bring hull information. AVIATION ENGINEERS ere leaders in modern progress Aviation depends upon engines, and ex- pert knowledge of aviation engines is « long step toward success in this rapidly growing industry. Many leading aviation engineers today took their first step by mailing a coupon to the I.C.S. at Scran- ton, Why don’t you follow their example? RADIO holds great rewards for trained men Almost in a decade radio has become a giant industry. The cpportunities created will be enjoyed by trained men. The International Correspondence Schools Radio Course, pre- pared by leading authorities and constantly revised, will help make you a trained man! A fascinat- ing beek—FREE. ANTERNATIONAL CORRESPONDENCE. SCHOOLS Box 2318-Y, Scranton, Penna. Without obligation, ‘send me full information on subject checked below: , Ct Air Conditioning O Aviation Engines Oi Inventing and Patenting LI Radio ClArchitecture B Highway Engineering EEoncrete Construction Poultry Farming 0 Drafting’ Cl Accounting O Good English EJ Salesmanship O Advertising Show Card Lettering [DO Civil Service D High School Subjects EtMechanical Engineering EtReading Shop Blueprints EFCivil Engineering Electrical Engineering Diesel Engines ` tEFGas-Engine Operating EtRefrigeration EfChemistry Name. z Address COMPRESSOR HEAD FOR MODEL A OR B FORD New head makes self-driven compressor with 60 cubic feet capacity and 150 Ibs. pressure. Only change is to cut off four valve stems in motor block. Smooth operation and long life. Operates one jackhammer with 65 lbs. pressure. Ideal for contractors, prospec- tors, monument workers and utilities. Used for drilling, breaklng 10-H RACINE, WIS. pavement, tamping, spray painting, sand blasting and general shop use. Head with high speed compressor valves, gaskets, unloader plng and instructions on installing $35. F.0.B. plant. A x GORDON SMITH BOWLING GREEN, KENTUCKY l Je Only NS gs Become a Talented Artist with Big -Income post Course also teaches commercial art, cartoon- PAID structions. 125 sheets of drawing paper FREE. COMPLETE Money Back if not delighted after inspecting. Complete $10 course only $1.95 POSTPAID or send no money and pay postman plus pos- EDUCATIONAL SUPPLY Eo t l METAL-WORKING methods make this amazing bar- gain possible. Complete metal working lathe with compound slide-rest, improved three-jaw chucking device, 6 in. swing, 24 in. overall length, 20 Ibs. Send postcard for catalog and 10-day trial offer, or A save time and send $1, balance plus express C.O.D, Woud-turning lathe $4.50. Extra bed lengths, 50c per ft. Attachments for milling, grindinu, B i Id Y Ow n Boat = You can easily construct any boat, from an outboard to a big cruiser, by following the simple instructions, plans, and com- plete details given in— to BUILD ° $ If your newsdealer is sold out, send 50 cants to FAWCETT PUBLICATIONS, | INC., 529 South 7th’ Street, Minneapolis, ing and lettering. By Alexander Murray, fa- ponding. paw-table, ete., available at low Brees. ° 20 | Minn. mous art instructor, 815 illustrations. Clear in- COURSE New designs and mass. production AMERICAN MACHINE & TOOL CO. pt. X, 200 Broadway, New York Boats 50c at All Newsstands 22 - Thank. You for Mentioning Modern Mechanix and Inzentions for August When Writing to Advertisers

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MOULDING A COMPLETE COURSE ON ARM BUILDING G. AN ARM of might with the power and grip to obey your phy- sical desires. I have taken weaklings whose arms were scrawny pieces of skin and bone and in a very short time de- veloped them into men of powerful pro- portions with bulging biceps and brawny forearms. He-men with strong, solid arms of power that are respected by men and admired by women! I don’t mean just a 16-inch bicep but a 15-inch forearm and a powerful 8-inch wrist. PROVEN, SCIENTIFIC TRAINING! This course is specially planned to build every muscle in your arm! It has been scientifically worked out for that purpose. Many of my pupils have developed a pair of triceps shaped like a horseshoe, and just as strong, and a pair of biceps that show their double head formation. The isinewy cables between the biceps and elbow are ideep and thick with wire cable-like ligaments. The forearm bellies with -bulk, the great supina- tor lifting muscles become a column of power, and their wrists are alive and writhe with cordy sinew. Start now to build a he-man’s arm! THE SECRETS OF STRENGTH REVEALED You can’t make a mistake. The reputation of the strongese armed man inthe world stands behind this course. I give you my secret methods of strength development illustrated and explained as you like them. Mail your order now while you can still get this course at my introductory price of only 25c. MIGHTY ARM\ "EA CORE IS BOOK SHOWS HOW.TO BUILD A MIGHTY ARM AND A 16 INCH BICEP I will not limit you to the arm, Try any one of my C test courses listed below at 25c. Or, try all of them for only $1.00. [= Rush the CouponToday! ¥ will include a FREE COPY of “NERVES OF STEEL, MUSCLES LIKE IRON”. It is a priceless book to the strength fan and muscle build- er. Full of pictures of marvelous bodied mea who tell you decisively how you can build symmetry and strength the Jowett Way!-Reach Out... Grasp This Special Offer! BOOK WITH PHOTOS OF FAMOUS STRONG MEN JOWETT INSTITUTE OF PHYSICAL CULTURE Dept, 37Hc, 422 Poplar St., Scranton, Pa. George F. Jowett: Send, by return mail, prepaid, the courses checked below for which I am enclosing——. O Moulding a Mighty Arm, 250 D Moulding a Mighty Back, 25d GEORGE F. JOWETT O Moulding a Mighty Grip, 25a “Champion | C Moulding a Mighty Chest, 259 _ of Champions’ O Moulding Mighty Legs, 250 Winner of many cons Strong Man Stunts Made Easy, 25e 0 tests for sti h tosto for ee rength and O All 6 Books for $1,00, Name Address Age — aaa Cr a a Ee TOTES) Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers 23

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tan POR oE ce p : vol, =f * Rates for classified ads, 10c per word per Insertion. Minimum 10 words. Gash should accompany order. Closing date first of second ` month preceding date of issue. Address Classified Mgr., Modern Mechanix and Inventions, 529 7th St. So., Minneapolis, Minn. A. C. GENERATOR TEN Practical and inexpensive changes converting Dodge 12-V, Ford T, A, Chevrolet Delco 6-V generators into 100-500 watt capacity A.C. generators, or into 32-110-V. D.C. motor or genera- tor. Dodge is 500-W self-excited, All in one book illustrated with complete simplified instructions and drawings for only $1. Autopower, 412 S5. Hoyne Ave., Chicago. ADVERTISING AGENCIES ADVERTISE: $15 reaches 6,000,000 readérs with 24 word ad. Newspaper and. mail-order magazine Rate-Guide, free: Chicago Advertising Agency, 22 West. Jackson, Chicago: FREE: NEW advertisers rate guide. Brown Advertising Agency, 140 South Dearborn, Chicago. ADVERTISE: 24 words in 250 news- papers’ $10, Lists Free. Advertising Service Bureau, 4650 Drexel, Chicago. ADVERTISE! 100 Co-operative maga- zines 5c word. Samples; stamp. Bryant, B33—MI, Hays, Kans. AGENTS WANTED AGENTS’ Gold Sign Letters for store windows. 500% profit. Free sample. Metallic Letter Co., 426 N. Clark, Chicago... BIG MONEY and Fast Sales. Every. owner buys Gold Initials for his auto, You charge $1.50; make $1.45. Ten orders daily easy. Write for particu- lars and free sample. American Mono- gram Company, Dept. 11, East Orange, New Jersey. BIG MONEY applying gold initials on automobiles. Easiest thing today. No ex- perience needéd. Free samples. “Ralco,” 1084. Washington, Boston, Mass. PENNY. each, any size! Gold window sign letters. 2500% Profit. Easily ap- plied: Free samples, Atlas Sign Works, 7941-G, Halsted, Chicago. CASH Income Daily Resilvering Mir- rors at Home. Replating autolights, re- flectors, tableware, etc. Outfit furnished. Write Sprinkle, Plater, 850, Marion, Indiana. AGENTS: Make 600% Profit Selling Cleaner, Polish, Shampoo, Vanilla, Tonic Laxative, Spot Remover, etc. Your name on labels. Free sample. Spacer Chemical, Dept. P-84, Dayton, io AGENTS: Smash go prices! Santos Coffee 12c Ib. 4-oz. vanilla 8i%c. $1.00 size Tonic 14c. 60c size Shampoo 814c. 100 sticks Chewing Gum 12c. Christ- mas Cards, 21 in box, 14c. 150 other bargains. Experience unnecessary. Write Carnation Co., MN, St. Louis, Missouri. FREE literature describing many busi- ness plans. D-Belfort, 4042 N. Keeler, Chicago. AUTO POLISH Formula, 800% profit. Full information free. Write Vanart Co., Box 36, Fruitvale Station, Oak- Jand, Calif. SELL Colored Folks: Iair Straighten- er, Bleach Cream, Perfumes, Incense, 300 Products. Write for Free Samples. Big Money Making Offer. Valmor, 5249 SM Cottage Grove Ave., Chicago. 500% PROFIT?! Gold'and Colored sign letters for windows, offices, trucks, signs. Monograms. ‘Easily applied. Neonite, Akron, Ohio. 24 CLEAN-E-ZE Polishing Cloth sells’ on sight, sample free. Para-Sweet Co., Pleasantville, N. J. $2 TO $15 profit per sale. Everyday necessity for men and women.. No in- vestment. Wonderful opportunity. Act quick. U. S. Supply, 5144 Cornelia, Chicago. ee AGENTS, WANTED to advertise our goods, distribute introductory packages and supply steady, consumers on -pro- tected routes. Unusual chance to make $37.50 a week. Write Albert Mills, 4513 Monmouth, Cincinnati, O GOOD Income plating auto parts, re- flectors, mirrors, by new method. Out- fits furnished; free ‘particulars. Gun- metal Co., Ave. H, Decatur, Il. MAKE MONEY. Collect $5; keep $4. Two quick selling dollar per month “hard times” life policies. Great North- ern Estate Corporation, Department C, Rockford, Ilinois. AGENTS—Rubber Sundries, Liquid Latex, $2.00 Gross Prepaid. ` B. Nalpak, 3225 Crystal, Chicago. AQUARIUMS EASILY made—good market. Tllus- trated Instructions 10c. Supply Credit. Century Aquarium, Fullerton, Pa. AUTOMOBILES REPAIR with good used parts for half price. Write or wire for parts needed. Auto Salvage Garage, Fayetteville, N. C. AVIATION ARMY Air Corps gives free flying training, salary, expenses paid. In- formation booklet, how to qualify, apply, 10c. Federal Equipment Co., Deer- park, Ohio. 7 Ft. GAS Powered model planes; K. D. Kit complete, less motor, $8.00 prepaid. Blueprints $1.00. 1/6 H.P. gas engine turns 16” prop, 4325 R.P.M. Complete catalog 25c ‘coin, P. Loutrel, 96 Mc- Donough St., Brooklyn, N. Y. USED Airplanes $85.00 up. Literature 10c. Federal Equipment, Deerpark, O. METAL tipped propellers; Fords, $9.98; Henderson, $8.50; Harley, un- tipped, $4.50; New production ships, $98.00; Aeronca Type 40 H.P. motors, $98. 00, including propeller. Photos, in- formation including leather bound flying manual, 25¢. Hibhs, Ft. Worth, Texas, AVIATION—Airminded young men interested in entering the field of avia- tion ‘as apprentices. Write, enclosing stamp. Mechanix Universal Aviation Service, Dept. A-12883 Mansfeld, De- troit, Mich. LORENZEN Propellers for your Air- plane will increase performance. The race pilots’ choice. New circular, dime. Lorenzen ‘Propeller Company, Niles, Michigan. i 100 AIRPLANES $80 up, flyaway. Repairable crackups, $60 up. Send 20c for complete list: Used Aircraft Direc- tory, Athens, Ohio. >- a 1933: FLYING MANUAL, 146 “page book of light plane and glider plans, still available at 50c. Modėrn Mechanix Pub. Co., Minneapolis, Minn. BICYCLES ELECTRIC Bicyéle is real sport, noise- less, original, Convert . yours. 3-18 mph. Complete plans, photographs. 25c coin. Electrobike, b, 2333 Honolulu, Hawaii. i : BLUEPRINTS facie ives HOMES for Newlyweds and 16-Seledt= ed Bungalows for Lean Purses, booklets containing illustrations and floor plage of low cost homes, sent postpaid for:2 in stamps or coin. MM Blueprint Dept., aH Modern: Mechanix Publ, Co., 529 /§ 7th St., Minneapolis, Minn. s, BOATS FORD Propellers—J. Pettit, 1852 West- lake Ave. N., Seattle, Wash. > feet 20” PONTOONED racer 50c: Griffith, 43. Girard Ave., Springfie Mass. ` BUILD your own kayak. Parts cut” to-fit. Everything furnished. Kits: as low as $7.45; Sail outfits $6.95. Rush dime for literature and special offers. Boat Shop, Greenville, Pa. : SAIL a non-sinkable kyack. Very rea-. sonable. Johnson, 4520 „Christiana, Chicago. BOOKS wo BUILD your model gas engine, boat, or model railway from illustrated hand- books, 35c each. List free. Fhe Model BOXING ` a LEARN boxing. Complete illustrated instructions 25c. Wrestling 25c.. Jiu- Jitsu 25c. Great strength quickly and ‘easily obtained, instructions and exer- cisers $1. Prof. Dryer, Box 1850, Chicago. a -BUSINESS OPPORTUNITIES | $ $$$$ $40,000—I made. it. Plan ` “MooreMade,” Lapeer, Mich. TIN Cans make useful products (no toy, flowers). $25 to $200. weekly: Plan $1.00.. Buckeye Service, Dellroy,. Ohio. TATTOOING Outfits, Supplies—Cata- logue. Guaranteed Remover. ‘‘Waters,” M-965 Putnam, Detroit. AMATEUR cartoonists, earn $25.00 week, spare time, copying cartoons: for. advertisers. Three-M Syndicate, Argyle, is : WISE MEN Get Money Easy! Plan 10c. ‘‘Mooremade,’”’ Lapeer, Mich.: OPERATE Chain of_ vending and amusement_machines. Be indepéndeént for life. Start small, grow big... M. poodzod ys 1826 East Main St., Roches- ter, N THE PLASTEX Industry needs manu- facturers on small scale and for big-pra- duction of Art Goods, Novelties, Souve- nirs, etc, in Plastex and Marble imita- tion. Experience unnecessary. 2c ‘ma- terial makes 25c articles. Rubber moulds furnished for speed production. We place orders and buy goods. Small ‘in- vestment brings big returns. Interest- ing booklet mailed free, Plastex Indus- tries, Dept. R, 1085 Washington Ave: ir New York. SUCCEED With Your Products: Tor- mulas. Processes. Analytical Service: Catalog free. A. Thaxly’ Co:, Washing: ton, D. C. STOCKS—How to make big -money without risk., Use my 20 years’ Ap- proved Tables. Mail $1.00 to help pay -expense. Hartig, 297B Cooper + treet, Brooklyn, N. Y. MONEY MAKING Seċrets, new ideas, original business plans and much valu. able information. Book 25c coin. Arn- derson, 2416 N. Springfield, Chicago. Thank You for Mertioning Modern Mechanix and Inventions for August When Writing to Advertisers

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BUSINESS OPPORTUNITIES SELL Novelties by mail. furnished. Catalogue, snappy sample 10c. Brawn, 353 W. 47th, Chicago. ATTENTION school graduates—guar- anteed moneymaker plan, dime. Stew- ard, Box 543, Zanesville, Ohio. CASH! Listing Local Names. esting spare time home occupation. Complete working plans 25c postpaid. Publishers Bureau, 850 East 47th, Chicago. : COMPLETE Chemical Service, Analy- sis, Formulas, Consultations. State Licensed Chemist. Twenty-five years’ experience. Write for literature. We L. Cummings, Ph.D., 428 Gordon Avenue, Syracuse, N. Y PAINT Signs for yourself and others, with Letter Patterns, Very simple and easy. No lessons or experience re- quired, Write for free samples. John ahn, A2120 Neva St., Chicago. $100 TON for certain common weeds, roots, Particulars 10 cents. M. Mer- titt, 1752 Nicholson, St. Louis. MAKE MONEY at home! Hundreds of plans, Magazine, 32 pages, three months 10c. Home Industries Co., Irvington, Nebraska. NEWSPAPER clippings pay. Complete instructions 25c. Goodall Box 1592-P, San Francisco. COLLECT old spark plugs. Worth 3c. Details 10c. 20 Moneymaking plans and 12 formulas 25c. Goldenrule, 2018 March, Kalamazoo, Mich. WOMEN-MEN interested earn money home; write, enclose stamp. Eller, F-277 Broadway, New York. HONEST people, to the few who realize that there is no square get rich quick method. The plan which has been mak- ing $25 a week clear will be sent for two dimes. Nothing to make or sell. No competition. Satisfaction guaranteed. Scott, Box 101, Taft, Oregon. WANTED—Men in every state to col- lect used auto parts for us. If you want from $5.00 to $100.00 per week for a few hours’ work, write for information, Enclose stamp please. Auto Salvage Garage, Fayetteville, N. C. MAKE Dazzling glass name plates; sun- flector daylite signs. Write. Rapido Service, Edwardsville, Illinois. MONEY comes easy to men in the know. Details, 10c. Confidential. Armourplan, 3206 W. 3rd, Vancouver, Canada. DOLLARS Daily! Operate home! Mail! Business. Details, Duffy Co., Coving- ton, Ky. tory, Edwardsville, Illinois. LIQUID MARBLE — Anyone ‘can make! Colorful, _glazed! ~ Molded, brushed, sprayed. Rubberlastic molds. Composition flooring. Big money mak- ing these! Particulars free. Marbleiz- ing Service, Edwardsville, Illinois. MAKE Molds of S R C, Synthetic Rubber Composition (cold process). In- expensive. Resembles real rubber. Fine for Novelty manufacturers. Marbleizing, Snow White Liquid Mar- be. Flintlike hardness. Wonderful for Novelties. Free Samples. Cowell In- stitute, Grayling, Mich. : CAMERAS AND PHOTO SUPPLIES MAKE Money in Photography. Learn quickly at home. Spare or full time. New plan. Nothing like it. i unnecessary. i tography, Dept. 2047, 3601 Michigan Avenue, Chicago. Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers 2 FREE CATALOG! Camera Bargains, Thousands of bargains, new and -used, imported and domestic cameras, acces- sories, movie equipment and supplies. Every item guaranteed and backed by our 35 year reputation for fair dealing, and sold on our 10 day trial plan. 230 South Wabash, Dept. MME-8H, Chicago, U.S.A. CARNIVAL GAMES MAKE you money—Outfits supplied, catalog 10c. ‘“‘Mooremade’”’, LaPeer, Michigan. CARTOONING CARTOONING instruction book. New modern method. 30 lessons, 125 illustra- tions. Only 25c postpaid. Laurence Publishing Co., 143 West 100th St., New York. : 2 SNAPPY original cartoons for $1.00 postpaid, A. B. Kvech, Rush City, CHALK TALKS LAUGH Producing Program, $1.00, Catalog Free. Balda Art Service, Dept. 65, Oshkosh, Wis. CHARTERS DELAWARE Charters; fees small; free forms. C. Grant Guyer, 901 Market St., Wilmington, Del. CHEMISTRY FREE chemical catalog. -Revised, low prices. Stamp appreciated. Chemicals, 157 Leonard, N. Y. C. DETECTIVES DETECTIVES. Make Secret Inves- tigations. Experience unnecessary. De- tective Particulars free. Write, George Wagner, 2640-V Broadway, N. Y. BE A Detective. Make secret investi- ations. Experience unnecessary. Write nited Detective System, 1623 W Grand, Chicago. $ : BECOME a successful detective. Ex- perience unnecessary. Detective: paper and particulars free. National Detec- tive System, Dept. D, 340 Electric Bldg., Omaha, Nebraska, DISTRIBUTORS WANTED DISTRIBUTORS: Represent manufac- turer. Sell Latex—self-sealing bandage that breathes. Great demonstrator. Lowest prices. 400% profit. Good re- peater. Exclusive territory, Neway, 3815-BW, Harrison, Chicago. and garage floors. County_ distributors wanted. Sample 15c. General Products Laboratories, Pittsburgh, Pa. DUPLICATORS $95. Rotary Stencil, Clay Composition, Gelatin Film. Most Complete Line in America. Photo-Litho Folder Free. Pittsburgh Typewriter Supply, Suite 551. Pittsburgh, Pa. EDUCATIONAL USED Correspondence Courses and educational books sold or rented. Inex- pensive: Money-back agreement. Cata- og listing 3000 bargains, free. (Courses Bought). Lee Mountain, Dept. 202, Pisgah, Alabama. WANTED—Names of men desiring steady outdoor jobs; $1700-$2400 year; atrol parks; protect game. rite kane Institute, M-32 Denver, Colo- rado. ELECTRICAL BUILD Your own fans. 20 inch alumi- num propeller for aeroplane fans $3.85. Shipped collect. Michael Electric Co., Fort Worth, Texas. ELECTRICAL SUPPLIES INSULATION, wire, varnishes, sup- plies, etc. Send 3c stamp for bulletin. Autopower, 412 S. Hoyne Ave., Chicago. FARMS AND FARM LAND LAKE Frontage—Private lakes, within new Federal forest preserve. Best fish and game section of Wisconsin. No time to lose. Free list. Arthur Goff, Cable, Wisconsin. FIREWORKS MAKE Fireworks! Giant-caps; spit-fire, flashes, etc, Complete directions only 50c. Sample 5c. Dr. Tampa, 10327 Throop, Chicago.. FORMULAS Processes. Analytical Service. Catalog free. A. Thaxly Co., Washing- ton, D. C. 24 SELECTED and tested formulas. Guaranteed! 50c (coin). Free liter- ature. Morgan & Respess, P. O. Box 104, Decatur, Georgia. 500 FORMULAS, trade secrets, 25c. Catalog free. Pelishek’s, Adell, Wis. FORMULAS — Interesting literature free. D-Belfort, 4042 N. Keeler, Chicago. FREE—Formula literature. Manufac- ture products yourself. Tomsen’s, 7309 Pingree, Chicago. TWO useful Formulas, Solder and Glue, mends everything. Both formulas $3.00. Ray Pippen, Urich, Missouri. FORMULAS 25c any subject. Ana- lytical service. Church & Galle Labora- tories, Marissa, Ill. TESTED FORMULAS Newest, guar- anteed! Catalog free. Grinstead Lab- oratory, Edwardsville, Illinois. FOR INVENTORS INVENTIONS now salable before pat- enting. Safe, practical. For informa- tion,, write Chartered Institute, 570 Barrister Bldg., Washington, D. C MARKETING Inventions on Small Capital, 25c. George Aymer, Route 10, Box 120, Charlotte, N. C. HELP WANTED WANTED Immediately, Men-Women, age 18 to 50, qualify for next eligibility test for steady Government Jobs; com- mence $105-$175 month. Common edu- cation, paid vacations, pension. Valu- able information from our Civil Service ‘Expert mailed Free. Write, Instruction Bureau, 234, St. Louis, Mo., Today. MEN Wanting jobs on new construction work in United States, So. America, other countries, write E. Moore, 1883 Hunter Bldg., Chicago. Enclose stamp. START new kind chain store without capital. Reference required. Hugh Amidon, Elyria, Ohio. $19.50, WEEKLY, sparetime at home. Instructions, 25c. Duffy Co., Coving- | ton, Ky. HYPNOTISM HYPNOTIZE instantaneously! New dollar book 25c. Lonk Institute Hypno- tism, D-1313, Palatine, Illinois. INFORMATION ALL AUTO Mechanics should know how to properly align the front axle assembly of the modern automobile to insure freedom from tire wear, shimmy and other steering troubles. Write for free information. M. L. Bryant, Box 205, Fayetteville, N. C. OLD age pension information. Enclose stamp. Judge Lehman, Humboldt, Kansas. i pi RELIABLE information, source sup- ply, any subject, $1.00 up. National Bureau of Information, Cedar Rapids, owa. vi

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INFORMATION INFORMATION—Any | subject—25c. Clifford : Price, Route 6, Chillicothe, Ohio. INVENTIONS INVENTIONS bought and sold at An- nual National meeting and exhibit of National- Inventors Congress, Hotel Sinton-St. Nicholas, Cincinnati, Ohio, August 14 to 18. Write immediately. INVENTIONS are the source of wealth and independence. What have you? Write National Service Bureau, Dept. H., St. Louis, Mo. INVENTIONS Commercialized. Pat- ented or unpatented. Write Adam Fisher Mfg. Co., 582 Enright, St. Louis, Missouri. INVENTIONS WANTED—Patented, unpatented. If you have an idea for sale, write Hartley’s Inc., Box 928-J, Bangor, Maine. SMALL Inventions wanted. A. Hull, 7829 Euclid Avenue, Cleveland, Ohio. INVENTIONS sell quickly if de- veloped to commercia requiremenis and properly presented. Every inven- tor should read “Development and Sale”? before showing or patenting his invention. Sent postpaid for $1.00. In- ventors Personal Service, San Fran- cisco; California. INSTRUCTION LEADERSHIP — Practical, planned success! Particulars. Michael, 4168 Maryland, St. Louis. SHOW CARD writing., learning. No long, tedious training. Course, plates, complete instructions $1. Simplified System Studio M, 1110 So. University, Ann Arbor, Mich. MACHINERY, TOOLS AND SUPPLIES HARD to Get Supplies: Tools, special- ties, hardware, pumps, gears, automobile parts. Electric Motors— 1⁄4 H.P. $7.85; Y% HiP: $11.49, Catalog 10c. Kostka, 2358-E South Crawford, Chicago. MAGIC LEARN Magic. Large illustrated cata- log of tricks you can do, 25c. Holden, 222 W. 42nd St., N. Y. MALE HELP—AGENTS MARRIED Man with spare time to distribute free samples coffee, flavoring, food products and make customers. Must devote'‘at least two hours daily and be satisfied with up to $3 in an hour, Per- manent. Blair, Dept. TFS-10, Lynch- burg; Virginia. MALE HELP WANTED MEN WANTED at once to call on stores with newest line self-selling 5c and 10c necessities. Strong, original counter displays. Aspirin, Mercuro- chrome, razor blades, household cement, etc. Automatic sellers. Many new items. Up to 125% profit. Big catalog Free. Procopax, Dept. 95-Z, 1956 S. Troy, Chicago. EARN $5.00 daily raising mushrooms in cellar, shed, attic. We buy crops. Guaranteed materials furnished. Odor- less method. Book free. United, 3950- BY, Lincoln Avenue, Chicago. FOREST JOBS easily available, $200 month. Cabin. Hunt, trap, patrol. Get details immediately. Rayson Service, K-32, Denver, Colorado. LOCAL AGENTS wanted to wear and demonstrate Free Suits to friends. No canvassing. Up to $12 in a day easy. Experience unnecessary. Valuable demonstrating equipment, actual samples Free. Progress Tailoring, Dept. H-137, 500-Throop, Chicago. MEN Wanting Jobs on new construc- Earn while tion work in nited States, South America, other countries, write E. Moore; 1884 Hunter Bldg., Chicago. Enclese Stamp. 26 MALE INSTRUCTION DETECTIVES. Work home or travel. Experience unnecessary. Write, Ameri- can Detective Institute, 2640-T, Broad- way, N. Y. MEBRY-GO-ROUNDS MERRY-GO-ROUNDS—New and Used Outtits—Catalog 10c. ‘Mocre- made”, LaPeer, Michigan. MICROSCOPES WOLLENSAK Standard 100x Micro- scope with extra ultra-lens 225x350x objectives $5.00 postpaid. Literature microscopes, supplies free. Pfleegor Laboratories, MM8, Milton, Pa. MISCELLANEOUS ie EU S n o oou SEND 10c for sample copy. Personal Movies Magazine, Canton: Ohio. CHASE Burglars! Make, install, simple alarm. Blueprint 20c. Electro- larm, 2901 Shakespeare, Chicago. LEARN new language. Ordinary con- versation. in one week, Thousands learn- ing. Instruction book 25c coin. Zendan, Burbank, California. LEARN TO PITCH. How to pitch curves, fast balls and others, ook with 56 illustrations, post paid for 25e. Be the best pitcher on your team. Bene- dek Supply, 2300 North Mason, Chicago. MODELS & MODEL SUPPLIES m ee OEE SU REIES o YOUR [Ideas developed into practical, working model. 30 years successful experience; thousands satisfied custom- ers. Confidential service guaranteed. Bank references. Send 3c postage for 32 page book “Making Inventions Pay.” Crescent Tool Company, Dept. T. Cin- cinnati, Ohio. BIG - New - Catalogs - No. 34. Engines, Models, Machinery, Castings, Blue- prints. No. 35. Materials-Supplies. Ei- ther postpaid 20c, coin or stamps. For- eign countries, 30¢. Refunded first order. Mlustrated circular Free, Evray Me- chanics Supply Co., 28 N. Clinton St., Chicago. BRASS gears and model supplies. Mail 10 cents for catalog. The Pierce Model Works, Tinley Park, Il. MODEL Steam Engines. Circular for 3 stamp, Lowell Robbins, Rapid City, MODELMAKING THE MODELMAKER. The Magazine for those interested in building model railroads, boats, engines. Send 15 cents for copy. Modelmaker Corp., 330M West 34 Street, New York, N. Y. MODEL MAKERS—Brass, copper, fibre, steel and aluminum in all shapes, also castings, gears, screws and fittings. Catalog 10 cents. Experimenters Supp! House, Dept. M, Box 10, Station Y MOTORCYCLES SEND 15c for illustrated used Motor- cycle catalog. Large stock. Bargains. Indian parts. Accessories, Indian Mo- torcycle Sales, Kansas City, Missouri. ALLOY Pistons. Harley, Henderson, Indian, Excelsior. Used parts, catalogue and wings pin 10c. Ballak, 100 N. 12th, St. Louis, Mo. ENGLISH racing and stock motor- cycles including new Excelsior Single $160. Used Indians, Harleys, Parts, accessories for all makes, Crash Hel- mets. Motorcycle books “Speed—How to Obtain it,” or “Motorcyclist’s Work- shop,” $1.25 each. New, Motorcycle Speedway Racing Magazine, snappy pictures and racing news $1.00 year. Send dime for catalogs. Clymer, 430 W. Pico, Los Angeles, MOVIE CAMERAS FOR SALE MOTION Picture Film, equipment, parts, at cut prices. Catalogue, free library, silent, sound. Mogull Bros., 1944-G Boston Road, N. Y. C. MOTOR WINDING DATA MOTOR winders: winding data, 100 A.C. motors, special selection, various horsepower and voltage, $1.00. Metor Data Service, 3002 Monroe, Kansas. City, Missouri. OFFICE SUPPLIES AND EQUIPMENT LOOSE LEAF sheets tear from: rings easily, mend them with Twin-Eyes a double, gummed, perforated patch that grips both sides of sheet at once. Simply moisten and apply. Nifty for the office. 10c coin per hundred postpaid. H. D. Lynch, 587 10th St., B'klyn, N. Y. LEGAL FORMS, all kinds, divorce, pension, patents, wills, partnerships, vacant lands, mining. Send stamped envelope for information. Law Book Shop, 2127 Mission, San Francisco. TYPEWRITER ribbons 45 cents each. Typewriters and duplicators for sale. Agents wanted. Standard Office Equip- ment Co., 1312 East 47th, Chicago. OLD GOLD BIG MONEY-—Instructions on how to test, buy and sell to the government, gold in discarded jewelry and teeth. $1.00. Alva, Box 7, Dayton, Ohio. OPTICAL GOODS ULTRA-LENS Pocket Microscope out- fit 250x(Diameters) Magnification guar- anteed, 50c postpaid. Reveals nature’s invisible worlds. Fascinating, instruc- tive, profitable hobby. Pfleegor Labora- tories, MM8, Milton, Pa. PATENTS PATENTS—Reasonable terms. Book and advice free. L. F. Randolph, Dept. 341, Washington, D. C INVENTIONS Commercialized. Pat- ented or unpatented. Write Adam | Fisher Mfg. Co., 582 Enright, St. Louis, Missouri. PATENTS. Booklet free, Highest references. Best results. Reasonable fees. Watson E. Coleman, Victor Build- ing, Washington, D. GET your own patents; legal- blanks, complete instructions $1. Cudding Sons, Campbell, Calif. PATENT ATTORNEYS PATENTS—Before too heavy an owt- lay of time or money is made on an invention, a search of the Patent Office records should be made to determine as nearly as possible whether or not the same idea has been patented before. The cost of this search is small, while the value of the facts it uncovers is often considerable. We offer inventors and manufacturers a thorough, prompt, con- fidential - search service—plus experi- enced counsel and assistance in every phase of Patent and Trademark practice. Write for my free book containing valu- able information relating to patent pro- cedure. Clarence A. Brien, Regis- tered Patent Attorney, 28-D, Adams Building, Washington, D. C. PATENT your idea. Other men have read and profited by our free book, “How to Obtain a Patent.” Fully ex- plains many interesting points to in- ventors and illustrates important mech- anical and electrical principles. With book we also send free “Record of In- vention” form. Prompt service, reason- able fees, deferred payments, thirty-five years’ experience. Avoid risk of delay. Write immediately to: Victor J. Evans & Co., Registered Patent Attorneys, out, Victor Building, Washington, PERSONAL GAIN Weight, simple, proven methods. Authoritative information. Details free. AMM, 6618 Quimby, Cleveland, Ohio. Thank You for Mertioning Modern Mechanix and Insertions for August When Writing to Advertisers

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PHOTO DEVELOPING FREE 2 World’s Fair photos, with or- der, roll film developed and printed 25c. Vibert, 72071%4 St. Lawrence Ave., Chicago. FILMS developed 5c per roll; prints 3c each, Ask for Special Bargain List. Roanoke Photo Finishing Company, 159 Bell Avenue, Roanoke, Va. 8x10 ENLARGEMENTS 25c; (send Film) developing and printing roll Alm 25c; 10 Kodak printed 25c. Cardinal Photo, Summit, . J. PRINTING 2000 BUSINESS Cards neatly printed eae Atlas Distributing Co., Roberts t., Pittsburgh, Pa. 1000 CARDS $1.40. Billheads $2.00. 500 Letterheads, 500 envelopes $3.50. Bredshaw, 3214 Huron, Chicago. 250 LETTERHEADS, 250 Envelopes, both printed, $2.50 postpaid. Pioneer Press, Richmond, Kei tucky. BEAUTIFUL chromatic four color letterheads, in smal] lots. Samples for stamp. Kolorprint, 7214 Duluth, Cleve- land, Ohio. 24 BOXED sheets, envelopes; name, address—60c. 3217 North 48th, Mil- waukee. RADIO RADIO Engineering, broadcasting, avi- ation and police radio, servicing, marine and Morse telegraphy taught thoroughly. All expenses low. Catalog free. Dodge’s Institute, King St., Valparaiso, Ind. GOLD, buried treasures located positive method. J. O. Andress, 333 30th St., Bradenton, Florida. COMPLETE blueprint plans for one tube converter that brings in short wave Programs on any radio sent for 25c postpaid. Many other radio blueprint bargains listed in new Modern Mechanix Blueprint booklet, sent free on request. Modern Mechanix Publ. Co., 529 So. 7th St., Minneapolis, Minn. icture negatives re- RADIO SHORT WAVE Set $2.95 kit form. Sets at factory prices. Free catalog M. World Short Wave map diagrams, etc., 20c coin, Radio City Labs., Suite 1217, 30 Rockefeller Plaza, New York. RADIO SETS AND SUPPLIES, FREE Electricity—6 Volt Wind Gen- erator. For Radio, Lights, Battery charging. Currier Mfg. Co., Minne- apolis, Minn. RAZOR BLADES FOUR Safety Razor Blades sharpened free. Send-three cents postage. M. C. Rice, Box 635, Longview, Wash. RAZOR blades sharpened super-keen. ie each. Pete Wetterquist, Rockford, REAL ESTATE OZARKS—Five. acres timbered river frontage, fishing, boating, pearling, shooting—$100, $5.00 monthly. _Hub- bard, 224 Grossman Bldg., Kansas City, Kans. ROOTS AND HERBS JUST OUT! World’s greatest “Herb Almanac.” Beautifully illustrated in natural colors. Contains over 500 old- fashioned herb medicine recipes and In- dian secrets for home use. 10c (coin) postpaid. Worth dollars! Bontanics, 145 W. 112th St., Chicago. SCENARIOS SCENARIOS, _Photoplays, Stories, Manuscripts edited, revised, typed. Criticisms, suggestions and valuable sales information Free. Write Profes- sional Institution, 1775 Broadway, Dept. 30, New York City, SPECTROSCOPES POWERFUL spectroscope. Colored. spectra sun, moon, metals—scores brilliant lines. New invention, fasci- nating field. Postpaid $2.50: Cutting Sons, Campbell, Calif. SALESMEN WANTED CIGARS, free name on cellophane, sells everywhere, sample box 60c. Con- tinental, 1320 Arch, Philadelphia. a a STROBOSCOPES STROBOSCOPE complete with elec- tric motor and neon light, $1. Cutting Sons, Campbell, Calif. THE WORKSHOP AVIATION—Propellers for your elec- tric motor. Blow the dirt off work bench, change air in room. The J.B.S. Propeller, Lititz, Pa. AMATEUR craftsmen you now can make that round top table you have been thinking about. Will furnish you with a beautiful walnut top, any size, state cl wants. M. Chamberlain, Chester, TRAILERS WHY Not go places, have home com- forts summer or winter in your Trailer Home? Build it yourself at small cost. Most simple construction, time - and money saving method. 9 to 18 ft. long. Plans, details, instructions, $2.00. W. Hoffner, 155 E. Delaware, Chicago, TIl. VENTRILOQUISTS LEARN Ventriloquism by mail; small cost, 3c stamp brings particulars. Geo. W. Smith, 125 North Jefferson, Room 611, Peoria, Ill. WELDING ARC-WELDING outfit $1.10. Weld fenders, braze, solder. Lavrow, 4368-W. Warren, Detroit. Stamp appreciated. TRADE, Sell, Buy. Welding outfits, -electric drills, grinders, fans, motors, generators, all kinds wrench sets, tool boxes, spraying outfits, gasoline engines, ` woodworking tools, firearms, etc. Tell us’ your_needs and what you have to trade. Enclose 25c for bargain list and clever idea for quickly built, modern camping. trailer. C. W. Carlson, 2212 Grand Ave., Omaha, Nebr. Build That Dream Cabin Now! New Lake Cottage Plans $240. inches done to a scale of 14-inch to one foot. Price of blueprints, including bill of material.. $2.50 “CROSS” Including the perch, “Cross” cottage is 16x20. É e living-room is 12x16, ar- ranged for two beds. Estimated cost of materials, #115; cost com- plete if you hire it built, $310. ba i “Cross Blueprints with complete specifications and bill of material Blueprints consist of a set of four, each 16x26 an VON” “Avon” cottage is 12x20, including porch. Living room 12x14% to accommodate two single beds. Es- timated cost of materials is $95. If you hire a car- penter to build ‘Avon,” the cost should run around, for complete specifications and bill of material “EDEN” Outside dimen- sions of “Eden” are 22x24. The main part is 14x24, contain- ing the living room, and there are two bed- rooms. Estimated cost of materials, $200; cost if you hire it built, $600. Blueprints giving $4.00 There are four other cottage plans in this series. “Bard” is 12x24, costs $110 for materials; “Dream” is 16x24, including porch, materials cost $125; “Forest” is 20x40, with fireplace, materials cost ag $400; “Nautilus” is a cabin that grows with addi- tions. Materials cost about $450. Send for free booklet describing these cabins or address blueprint orders to MODERN MECHANIX PUBLISHING CO. 529 S. 7th St., Minneapolis, Minn. Thank You for Menticning Modern Mechanix and Inventions for August When Writing to Advertisers . 27

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9 Hours To Build Mead’s NEW SPORTSMAN’S BOAT! . Assemble Mead’s sensational new: 30-lb. Syortsman’s KI-YAK in 9 hours at home from complete, accurately- cut kit, only $22.50 F.0.B. Seats two with space for camping equipment. Lightest, strongest boat for its size in the world! Fast as a flash! PORTABLE! Safe. Size: 14’ x 30’, Draws 2” to 4” of water. Nothing else like it. Entirely new unique type construction. Easy to assemble. Sail equipment extra. For FISHING, CAMPING, HUNTING, SAILING! Mead’s new SPORTSMAN’S KI-YAK enables youto fish, hunt, camp and sail. really four boats in one! For verea sport, utility AND ECONOMY, get yours now. Prices megy soon go up! GIVEN $6 Double- Blade Paddle now given with your Ki-Yak if you hurry. HURRY! Rush 10c today for illustrated Circular and details of Free $6 Paddle Offer. Do it now! 12 S. MARKET; GLID ERS ll CHICAGO’: 5¢&10¢ COUNTER GOODS Handle Regular Store houe Quick Sales—Steady repeats—up to 112% profit. Sell merchants 85 different merchandise displays. Complete line Razor Blades; sen- sational new Aspirin Deals—16 tablets for 10c instead of 12, 6 tablets for 5¢ instead of 4; new Chocolated Laxative, Mercurochrome, Adhesive Tape, Magic Cement, Confections and many others. NO INVESTMENT TO START Just call on regular customers and take repeat orders, “I sold your line past 4 years. Since the first week I averaged over $50,” says Phil Agne, of Ill. Merchants often buy 2 to a dozen different eardg at once, Sell only few cards daily and you make up to $65 weekly. Start making money first day without spending a penny. Get FRE CATALOGUE and full information. WORLD’S PRODUCTS CO. Dept. 8814 Spencer, ind. TOBACCO Wo man or woman can escape the harmful effects of tobacco. Don’t try to banish un- alded the hold tobacco has upon you. Joln the thousands of inveterate tobacco users that have found it easy to quit wlth the aid of the Keeley Treatment. ae ; Treatment For Tobacco Habit Successful For Over 50 Years . Quickly banishes all craving for tobacco, Write today for Free Boot: telling how to quickly Free yourself from the tobacco habit and our Money Back Guarantee. KEELEY INSTITUTE, Dept. D-765 Dwight, Ilinols Home of the famous Keeley Treatment for Liquor and Drugs. Booklet. sent on request. Correspondence strictly confidential. Send for ALLIED'’S Big New 1934 Catalog... featuring kits and parts to build the new type Short Wave, Long Wave and World-wide Radio Recelvers. Our prices are consistently lower. Write today for this valuable book, It's FREE! Ad- dress Dept. B, 833 W. Jackson Blvd. Allied y Radi CORP R TION ee 833 W. JACKSON BLVD., CHICAGO, ILL. LEARN TO DANCE $450 at Home-=Learn the Latest Broadway Steps. Lead and follow correctly. Learn the modern Fox Trot, the Dreamy Waltz, latest Tango. Society steps. Learn all the old favorites. Round-Square Dances, latest Barn Dances, Don’t be a wall flower. Easy aa A-B-C. No music or partner required. Make your dancing Magnetic, Fascinating. Alluring, Glamorous, Profes- sional, Evens child can leam. Equals $20-Course. SEND NO MONEY. Pay Postman $1.60 plus a few cents postage. DANCE STUDIOS, P. 0. Box 674, McAdoo, Penna. =Every deaf person knows that— Mr. Was made himself hear his watch tick after being deaf for twenty-five years, with his Arti- ficial Ear Drums. He wore them day and night. They stopped his head ¢ noises. They are invisible andcomfortable,nowires / or batteries. Write for TRUE STORY. Also : bookleton Deafness. Artificial ar Drum THE WAY COMPANY. 741 Hofmann Bldg. Dotroit, Michigan ATCH REPAIRING AT HOME Yov can learn by our modern and orig- inal system of instruction every part of the Watch Repairing Trade at home as good or better than at a shop. You can earn money while learning and se~- cure a well paying posttion or start in business after completing our course of instruction. Good _watch repairers are always in demand and earn very good salaries. For particulars apply to the MILWAUKEE SCHOOL OF WATCH REPAIRING 524 È. MASON ST., Dept. C MILWAUKEE, WIS. WOODWORKER AND CRAFTSMAN VISE carefully and accurately finished. Width of jaws 6”, depth of jaws 2%”, opens 6’. Weight 6 lbs. A strong rugged Vise that will give lasting service. Special price $1.39 prepaid. West of Rockies $1.79. Order this Vise now from HILLSDALE MACHINE & TOOL CO., ino. HILLSDALE, MICHIGAN a DRIVER AGE Te Every motorist wants night Driving Protection. Amazing simplo in- vention, called Mirror-Lites, fits any make of headlight bulb. Kille that dangerous glare. Attached in a jiffy. Focuses and _ intensifies the light. Puts new life in old reflectors. Chromium plated, out: lasts the car. The cheapest night driving insurance ever offered. Sold on money back guarantee. Retails 50c a pair. Sample pair, 256, prepaid. CURRIER MFG. CO. 262 Terminal Minneapolls, Minm- 28. Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers

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Here’s another way to take your town by storm—set this BIG, AT- TRACTIVE LOOKING OUTFIT up in a show window and see the crowds gather round. Let the peo- ple see the delicious Potato Chips or Do-Nuts tumbling out, and they .will crowd around you in droves and buy your factory fresh Po- tato: Chips. The il- lustration below of the Chromium Plated a a Be a Wholesale Distributor A new, fast way to have plenty of money to ay your bills—meet the mortgage—live well—BE OUR, OWN BOSS. Make 500 to 600 Per Cent INCREASE on raw materials—keep up to 80c out of each dollar you take in. Start right in your own home or in a vacant store—any place where you have a few square feet. My NEW SIMPLIFIED METHOD and COMPLETE OUTFIT starts you in a permanent, profitable business manufacturing equipment I behind ‘you to assure yout success, furnish in my four tasty foods—deliciots crisp ‘Potato Chips, - COMPLETE | Vat Furnace and Dt- Cheese Chips, Do-Nuts and Salted Nuts: You begin mak- DE Say : rektora Pee a ing money at once. No experlence needed. I place 50 years EASY TERMS. only a sma pan a of Successful Experience of LONG-EAKINS COMPANY m = . = the complete z > big KITCHEN , , : o A DUIE I Plan the Selling for You— — > a : 4 You Supervise and Collect : ' the Profits — Be a Wholesaler — make established deal- ers your salesmen. I have Brand New, Sure Fire selling plans. All you do is tell the dealers about this plan— and the PROFITS START..ROLLING IN. With my new pan you can also ave every boy and ing for you. Dealers ev- erywhere waiting to be sup- plied.: COMPLETE IN- STRUCTIONS. Formu- las direct. from my Test- ing Plant in Springfield— all furnished to you. PAY AS YOU EARN— Low Easy Terms I make terms to good, honest, industrious people r a who show me they want girl in town selling to make money quick. You Potato Chips for you. don’t need a lot of money to start This plan is so. simple, you can __pet it back the first few days instantly see it will. make you ` you operate. A bag of potatoes, famous. over night. Groceries, Deli- some cooking-fat, and a little salt, catessens, ‘Restaurants, Bakeries, and. you are ready to go. EVERY- Soda Fountains, Drug Stores, THING. FURNISHED to start Confectionery Stores and scores: for less than a down payment on a cheap of other dealers do all the retail- car. CASH COMES BACK QUICK. COMPLETE OUTFIT Chromium Plated Furnace. New improved Type Gas Burn- er, Chromium Plated Cooking Vat, Metal Drain & Board for Vat i irec t-to-fat Slicer, Large Draln Basket, Large Wire Chip Skimmer, 8 Raw Chip Baskets, Drain Pan tor Baskets, Grease Thermometer, Stirring Paddle, READ What Indiana Operator Says F. A. PEOPLES “For the past six years I have been knocking about on one thing to an- other—all the time on the lookout for a substantlal and dependable busi- ness, which could bo estabilshed with small capital, In looking through a magazine, I came upon an advertisement of the Long-Kakins Company, lo- cated in Springfield, Ohio. I went over there and was perhaps over-cautious and in all, made three trips before deciding T was on the right track. I have had this outfit in operation. for _] Just. seven days and to say I am both surprised and delighted is puiting it mild—selilng all the Chips I can make.” 500% INCREASE On Raw Materials Actual tests show $8.00 Withmy new Improved slicer, included with CASH SALES from 63c thisoutfit,afull’ ‘frying’ of rawpotatoes can very Raw Potatoes, made into {pichiy be silced into Chips. My specially con- irving watao tat the structed Cooking Vat gives Potatoes Tan “directly Outfit greatly increased ca- trouble of soaking and pacity. Fries 16 ounces fine nee Quality, Finished Chips in FOUR eas MINUTES. Many food authori- KIAN] 0l] Fr ties are now recommending the Ga ieee eer sale of unpeeled Chips because they Îl fi retain the. minerals found in, and under the skin of the Potato. With | i S l my. new KITCHEN COOKED 842-S So. High St, -> OUTFIT you can. specialize’ in | Springfield, Ohio. ". | Mineral (unpeeled) Chips — Be- i Dear Sir: l H. W. EAKINS, President, Long-Eakins Company, sides Potato Chips, you can_make extra profits with Do-Nuts, Salted Nuts and Cheese Chips. I am anxious to make money. Send me all the - facts without any obligation. Tell me how I can | get in this amazing, new business, QUICK. The LONG-EAKINS Company Manufacturers of Carmelcrisp and Crispette Equipment 842 S. South High St. Springfteld, Ohio | ADDRESS NAME cessssssecsesssoree r ER E E E Thanh You for Mentioning Modern Mechanix and Inventions for August When Writing-to Advertisers 29

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BOYS! BOYS! BOYS! Throw Your Voice Into a trunk, under the bed, under a table, back of the door, into ~~ a desk at school, or anywhere, You get lots of fun fooling the 3 teacher, policemen, peddlers, and surprise and fool all your friends besides. i THE VENTRILLO is a little instrument that fits in the mouth out of sight. Cannot be detected. It is used in connection with the above, and with the aid of this wonderful DOUBLE THROAT, or VENTRILLO, you can imitate all kinds of birds, animals, etc. Remember you get everything for ONLY TEN CENTS—a booklet giving you full instructions how to become a ventriloquist and throw your voice, the Double Throat, or Ventrillo, also a copy of our MONTHLY MAGAZINE, “FUN, MAGIC AND MYSTERY.” ALL FOR.ONLY 10 cents. Johnson Smith & Co., Dept. 719, Racine, Wis. RADIO |250 MAGIC TRICKS SILENT: DEFENDER y E A Enjoy the MADR An excellent little book a Used by police officers, detectives, A. ` as a means of self-protection. Very oonosrts g EASP containing neorly 300 tricks baseball p for parlor or stage that ony- games, mare ‘one can do. Tricko with sheriffs, night watchmen and othera Est reports, cards, coins, handkerchiefay A yeces, bottles, string, etos effective. Easily fits the hand, the N Also Second Bight, Shadowe fingers being grasped in the four SS po EEFI graphy; eto, Profusely ile holes. Very useful in an emergen- RADIO GETS” shows how to mmako and ` tustrated: 100 postpald, i ey. Made of aluminum they are very Operate inexpensive Radio Gets, the ma- f 325 CARD TRICKS snd sleight of hand: Tight, weighing less than 2 ounces. ier Re Re bea coer EA ones vitae | Seea ator dac postnald. 770 pose Coulee Te Receiver for bringiog in foreign etatione, | posure of card tricka uscd by professional Prico25c ea., 2 for 45c postpaid. 770 page Catalog 10e. Dolica ealla, chips at eea; eto, ONLY 15c p.pd. | gambler. Price 25coostpold, oretampss ~ MIDGET BIBLE | SURPRISE MATCHES ~ Wondortas Ri = More fun than j Inetrumonts GREAT {CURIOSITY fighting with your SmallestBible wife, Look just in the World. tin like ordinary matches, As the victim tries to light i one be gets quito & Pe a é a j gi | surprise, 4, á J È pann Prica 10c par box, 3 boxes for 25e, 92 for 75 conle, } - leut with iz sean to be ap; iated, Make good money STAR TOY MAKER a Gad, Carlous and to seliing them to Trends. churoh acquaintances, G: ing. Lotsof pleasure as well PRIGE N30 engis d, tor 400, TA (ot Vitten; Tells how to: Bs very usefat. Jt 1a a double Microscope Jor ome „50. leCamera, a Canoe, w mining the wonders of nature. also an FERE edenn P modol Railroad, @ Tele! Opera Glasa, & Stereoscope, a Burning , & Reading a for use with Midget Bible ‘aph’ Instrum: lass; & Telescope, a Compass, & pocket Mirror, and a ite, Talking Machine ,| Laryngoscope—for examining eye; ear, nose and throat. 16 SERPENT’S EGGS Microscope. E lee tr {9 ia worth all the cost to locate even one painfal cinder In the Bor contains 12 exes, When Water Wheel lator, le Belt. leye. Folds flat and fits the pocket. Something great—you eel. Paddle Raft. a pair of Skis, Hi eS etok, eaoh one : W | a Dog Sled, Bird House, Rabbit Yard, ete’ |2994 one. Don’t miss It, Sant by mall. Oniy 350 of 3 tor $1.00. snake al ge Gipesges. 160 illustrations. PRICE 10c. TOR Oc ELECTRIC MO Ss Tella how to mako chemical toys, electrical ‘essary toys, galvanic toys, mechanical toys, paper toya, cardboard toys, bonte, traps, eto: 200) RUNS illustrations, Price 250 postpald. BOY'S OWN TOYMAKER., A new book. | All Parts Nete tor Oniy An Electric Motor for Oniy 19 N cents. Sounds almost unbe- lievable, but it is perfectly FUN WITH MAGNETISM. 50 novel and La trae. For ONLY 10cents wo STAGE Withabuneh | uniqvo experimenta in MAGNETISM sth jp send you all the parte nocens 4 n you can Tform À z a MONEY p ibeobilla | GPRM oa Tid of an ordinary magnot a fallprintedandillustrateddi- magnetio chain, feeing and . E z rections for assembling, No each person z epinning needis, pail and trouble atall patting theparta of limited id Pall cluster, magnetic felt 7 E together in fact it is BUN. means to | top, motor, magnotio billiard balls, many other. SEY sustfoliow a warding: appease | Stunts. Also interesting information ebout ` Tow minutes the progperoua ladestone, magustism, electric ty, eto. PRICE \ ~ motor is ready 7 flashing | BOOK GN BOATS. How to pulld rowing. zune & Toll Of | sailing boats, Everything pertaining to boata these Diils | explained in plain terms so anyone can undere at theo] stands Iliustrated. 10¢ opd. z BZD r O D OT |5-MINUTE HARMONICA COURSE, À time and peeling off a genuine blij | new easy celf-teaching method. Teaches how wa Fortune Postage 50 extra. Price 10s LEARN to or two from the outside of the roll, | to play, to uso the tongue. tremolo, fully With the aid of a H the effect created will be found td j Pree tae postpaid. Fv Hypnotize be all that can be Gesired. Prices, ‘ti a i iy | tunities for averyone. O4 page copyrighted t postpald: 40 Bilis 20c, 120 for 50c, | book chook full of money-making ideas, recipes, to yoar future, ı Thisremarkable or $3.50 thousand postpald, | formulas, wrinkles, trade secreta, eto. Buel- Se Will you ba book tells how. v | nesses that con be started with little or no fF a” | lucky in love? Explains all o s E F LUTE capital at home in spare time. _ 10a postpald. 5 Suc ceesfal in bout > N TRICKS & SOCIAL ENTERTAINER. Co > business? Will about Hypno: Tha Magio Nose Flute, or Hu» | tains hundreds of eimple tricks, illusions, di yoube wealthy? tism, how to manatone, is @ unique end | Versions ¢hat anyone can do. Also explains Complete with T hypnotize, how novel musical instrument that | cecret of second P © pos = i dictionary SE | to produco sleep, how to wolabined” ‘There is onta WONDERF' X-RAY TUBE descriptions and correct interpreta- | awaken a subject, how tonyp- re tithe kua: ok in play fvondertul etle tions, with lucky qnumbers. forma. - | notize animals, hypnotism in ich, when onve aoe nstrument pro- jna! ya, oracles, divination, pam- | diseases, hypnotisin for scien- b gorod ftor a little prao- ducing optica){istty. etc. Also tells how to tell . fortunes by various methods, by | tific practice, illusions and produce ve è fituslona — both| grounds of coffosor tea, by domin- | halucinations, personal mag- that i surprising and foes, by marka, scars, or moles, mis- } netism. thought transference, z resembles 4 flute. There 6tartling. With {t}cellancons games with carde, lucky | etc. Written in plain, everyday k no fingering, and once you have mastered | yon can seo what [s apparently the bones of }@878, weeks , months, years; howto | language that an: Body canunder- you oan play oll kinda of musio with facility | your fingere, tho lead penell, the In-|receive oracles by dreams, finger | stand, PRICE 10c postpaid. NEON cmr Eao tari opaning in s i Fa end mahy other nail observations, etc. PRICE 10c = AN emira g cn FORTUNE TELLING BY CARDS JOHNSON SMITH & CO. ae Rook shows how to tell fortunes V:i Dept. 719 RACINE, WIS. 5 with cards, dice, dominoes, crystal, etc. Tells the meaning and sig- nification of every card. Several dif- ferent methods explaized and fully illustrated. Crammed full from cov- er to cover with complete informa- tion on fortune-telling. PRICE 100 postpaid, Stamps accepted, Ji CATALOG A copy of our NEW CATALOG mailed on receipt of 10c, or the De i Luxe Edition with cioth binding 25c. Bigger and better than ever. : Only book of Its kindin eaistence. Contains thousands ofalithe latest tricks in magic, the newest novel: » puzzles, games, sporting goods, rubber stamps, unusual an teresting books, cunosities DOVELE in seeds and plants, etc., unprocurable elsewhere. Remit Coin, b CO. Money Order, Check or unused U. S. Postage Stamps, for all artis MELOOLEITE cies iisted above. Canadian money, stamps and Postai Notes 7 accepted at current rate of Exchange. Address orders for all goods on above andon following page to JOHNSON SMITH & CO., Dept. 719, Racine, Wis. 30 Thank You for Mentioning Modern Mechanix and Inventions jor August When W riting to Advertisers

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‘Sent by Mail for Only A Fascinating : and - Interesting Pet If you want a fascinating and interesting little pet, just risk a quarter and we will send you a real live PET TURTLE by mail postpaid to any part of the U.S.A. Now all the rage. ‘Thousands upon thousands of these Turtles were sold at thé World’s Fair in Chicago. No trouble at all to keep. Just give it a little lettuce or cabbage or let it seck-its own food. They are extremely gentle, easily kept and live for years and years. Needs less atlention than any other pet. Get one or two. Study their habits. You will find them intensely interesting. ONLY 25c each sent by mall. Special Turtle Food 10c package a_a eect’ A ure ood We package Electric Telegraph Set BOYS! A private Electric Telegraph Set of your 1 Se © ownfor15e. Lots of fun sending messages to your friends. Better still get two sets, hook them up as shown in the directions, for TWO-WAY MES- SAGES (sending and receiving). No trouble at all to operate with the simple instructions that ac- company each set. Operates on any standard dry battery obtainable every- where. With this outfit you can learn to transmit and receive messages by the Morse International Code, and in a very short:time become an ex- pert operator. Mounted on wooden ase measuring 4 x.3 in., first class construction throughout, complete with key, sounder, magnet, min- iature Western Union blanke, packed: in neat box with full illustrated instructions — we if p OT NO: eeri ASH š ALL FOR 15c (without Add 10o for 64 battery) postpaid apos rarity (Canada and Foreign 200.) written specially for boys. Tella how 3410 page catalog of e batteria dy: tomak poweitios. jokes, pamos, motors, radion ricks, puzzles, legraph |. apparatus books, ete: 4c. o o pigia ahi let Dert.718, Racine, Wise ` Seines.: PRICE 100 ppd: dinh v s NO TEACHER NEEDED--SURPRISINGLY SIMPLE SYSTEM ‘Persons having neglected their Musical Education need not despair, for with the aid of our new VAMPING CARD (placing the card upright over the piano keys), you can Vamp away to thousands of Songs, Ballads, Waltzes, Rag Time, etc., etc. No knowledge of music is required. After using it a few times, you will be able to dispense with the aid of the Vamping Card entirely, The prico of this very clever invention is only {50 postpaid. BIG ENTERTAINER FUN, MAGIC and MYSTERY £26 Jokes and Riddles, 25 Magie Tricks, io Parlor Games, 73 Toasts, 13 Fairy ‘ales, 105 Money-making Secrets, 2 p onofogues, 21 Puzzles and Problems, Comic Recitations, 10 Funny Readings 1) Parlor Pastimes, 18 Flirtations, 1116 Girls and Boys Names and their Mean- ngs, 10 Picture Puzzles, 69 Amusing ymes, 37 Amusing Experiments, Deaf ypsy Fortune Teller, How to tell Fortunes with Cards, 'Co: ee Cup, ete., Hypnotism, Ventriloquism, Cut-outs for Checkers and Chess, minoes, Fox and Geese, 9 Men Morris, Spanish Prison Puzzle, Game of Ana- ms, 25 Card Tricks, Crystal Gazing ete. ALL FOR 15 CENTS POSTPAID UMammoth 710 page Catalog of novelties, jokes, tricks, puzzles, ete., 10 Cents. aa JOHNSON SMITH & CO. (VALEE Dept. 719 RACINE, WIS. A copy of our NEW CATALOG mailed on receipt of 10c, or the De Luxe Edition with cloth binding 25c. Bigger and better than‘ever. Only book of its kindin existence. Contains thousands ofalithelatest : tricks In magic, the newest novelties, puzzles, games, Sport g goods; rubber stamps, unusual andinteresth.g books, curlosit in seeds and plants, etc., unprocurable elsewhere. Remit by Coin, Money Order, Check or unused U. S. Postage Stamps, for all arti- cles sted above. ‘Canadian money, accepted at current rate of Exchange. and Dumb Alphabet, Shadowgraphy, ice, Dominoes, Crystal, JQHNSON SMITH b CO. ‘|| RACINE WIS- t stamps and Postal Notes T TURTLES P LANK CARTRIDGE PISTOL REVOLVER STYLE 25c .22 CAL. MADE IN3 SIZES Three new models now out 25c, 50c and $1.00. Well made and effective. Mod- elled on pattern of latest type of Revolver. Appear- h ance alone enough to scare a burglar. Takes 22 Cal. \ Blank Cartridges obtainable everywhere. Great rotection against burglars, tramps, dogs. Have it § lying around without the danger attached to other revolvers. Fine for 4th July, New Years, for stage work, starting pistol, ete. SMALL SIZE 4 in. tong Ñ 25c. MEDIUM SIZE S in. long SOc. LARGE SIZE Gin. long $1.00. BLANK CARTRIDGES 50c per 100. HOLSTER (Cowboy type) SOc. Shipped by Express on'y not prepaid. 710 page catalog of other pistols, sporting goods, etc. 100° FRENCH PHOTO RING Here is a very great novelty in Rings, that is selling in thousands, It is a nicely made ring, finished in imita- tion platinum, and set with a. large imitation diamond. It looks just like an ordi- nary ring, but in the shank of the ring is @ small micro scopic picture almost invisi- ble to the naked eye, yet is magnified to an almost in- credible degree and with as- o bit tonishing clearness. There is quite. ań ass sortment of pictures that should suit all tastes. Some are pictures of bathing girl beauties, pretty French Actresses, etc., others are views of places of interest in France, Panama Canal and elsewhere; others show the Lord's Prayer in type, every word of which can be read by persons with normal eyesight. They are inter- esting without being in any way objectionable.. PRICE 25¢, 3 for 65c, or $2.25 per doz. postpald. 7/0 page Catalog 10e. CHAMELEONS—Shipped by Mail—25e WATCH IT CHANGE ITS COLOR ` LIVE DELIVERY GUARANTEED Get one of these most wonderful of all creatures. change its color. Study its habits. Wear one on the lapel of your coat as a curiosity. Watch it shoot out its tongue as iL catches flies and insecls for food. No trouble to keep. Can go for months without food. Measures about 4 inches in. length. Shipped to any address in U. S. A. by mail. We guarantee safe arrival and live delivery. PRICE 25c, 3 for 50c, POSTPAID. Subscribe to our Monthly Magazine FUN, MAGIC AND MYSTERY |] We also publish a monthly magazine of [| FUN, MAGIC AND MYSTERY. Each flissue contains a big collection of parlor magic, tricks with cards, fortune-telling, funny readings, amusing experiments, money-making secrets, jokes, riddles, conundrums, parlor amusements, puzzles, roblems, science, mechanics, etc. In add- ition it will list all the latest novelties, tricks, puzzles, etc. Because itis really a magazine and catalog combined, we have = fixed the subscription price at ONLY 10c per year, or 3 years for 25c. This as you readily see docs not even cover our mailing expenses, let alone the cost of getting up the magazine. Try this magazine for one year. Watch it ker. Explalns different varieties of poker soch s8 traight Poker, Stud Poker, Whiskey Poker, Mieti- gris, The Freeze-out, The Widow, Buck, Jack-Pote etc.’ Exposes the methods used by card sharpers and professional gamblers. 13 Chapters, This book con- PRICE 10c postpald. 710 page Novelty Catalog 100 = How to Pitch Real Curves Pitch the Fade-a-way, Spitter, Knuckler, Smoke Ball, etc. Lessons by leading Big League Pitchers. Clearly illustrated and How to Win at Written by a card sharper. Tells how to win at drew tains a vastamount of information and may save yoo from being fleeced by crooked players and gamblore. described with 56 pictures. Only 25c } JohnsonSmith Co. Dep. 719 Racine Wis- Address orders for all goods on above and on previous page to JOHNSON SMITH & CO., Dept. 719, Racine, Wis. Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers 31

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New Quick Relief Works Faster — Medical authorities discover new scien- tific facts about cause and relief of pain—new formula stops pain by relax- ation — quickly — safely — scientifically Poo now say that most Head- aches, and other severe pains are caused by (1) Acid Stomach or (2) Nervous Tension. MODERN DOCTORS prefer Hexın— an amazing new scientific formula — because it is, alkaline and because it relieves pressure on nerve ends (the cause of pain) by relaxing tense muscles (the cause of this pressure). Users say they are getting relief with unheard-of speed. BECAUSE HEXIN IS ALKALINE, it does not upset the stomach as acid tablets do. No druggy after- effects either. Just light- ning-quick relief. GIVE US A PAIN COMBATANT— mothers asked—that our children can take with safety. Give us a relief for pain and fever that is milder and better adapted to the delicate systems of children than ordinary tablets—so strong and so acid*, SO HEXIN—an alkaline formula — was originally developed for children. Its action had Modern Druggists Prefer HEXIN Buy a box of HEXIN today. If your druggist should not have tt on hand, insist that he order it, You can buy HEXIN in con- venient tins containing 12 tab- lets and in economical bottles of 50 and 100 tablets, Don't let your druggist give you any- thing bue HEXIN. Nothing else ts “just as good”, 32 - to be gentle and safe. What’s mild enough for your child is better for you. But don’t be misled about the effectiveness of HEXIN for adult use. The action of Hexın is mild but RELIEF IS IMMEDIATE. IN TRYING TO BREAK UP A COLD, do not add acid* tablets to an already acid stomach. Hextn relieves colds by striking at the cause. Most people find that 1 Hexin tablet every hour until 6 or 7 have been taken keeps a cold from starting or greatly relieves one that has started. BUY HEXIN at any modern drug store. Take 2 tablets with water. At once, nerves start to relax. At once, HEXIN starts to com- bat acidity. Before you realize it, you are freed from those two invisible competitors— pain and discomfort. MAKE the only test that counts. Try HeEx1n yourself at our expense. Mail the coupon now. You'll never know what quick relief is till you try HEXIN. *Hexin is ALKALINE (non-acid). jinne eiie oat EXIN, INC., 8 South Michigan Ave., Chicago, lli. i l Please mail me a generous free sample of HEXIN. MM1B34 i l City en Stale ee eS L me n p e ES SS e NO Thank You for Mentioning Modern Mechanix and Inventions for. August When Writing to Advertisers

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Motor-Driven| INVENTORS SHOP TOOLS MECHANICAL. New 1934 line of “Delta” Quality Tools includes improved motor- driven Jointers, Band Saws, Cir- Can You Answer these cular Saws, Lathes, Drill Press, Questions? Moulding Cutters, Scroll Saws, and. Wonderfol LIFE-LIKEB- enlarg Boring, Routing, Mortising, and menta, bust, full length.or -part 4 What is the only effective way e Sanding Attachments, and com- ONLY of group, pets or plete line of accessories—all at the new low price levels. FREE gother subjects, to protect an invention ? now made from Send Today for FREE illus- trated 56-page Catalog, and any photo, snap- shot or tin type at details of. 10-Day Trial Offer Catalog di and EasyPayment Plans, No obligations, W the amazingly low Q What is fi t te in making introductory price ] git ; DELTA MANUFACTURING co, of 49ceach. Sendas $775 No. Holton St. Dept. M834 ' Milwaukee, Wisconsin many photos ‘as you EA CH desire enlarged ea SIZE OF ENLARGEMENT while this price lasts. Return of 11x14 inches the original photos guaranteed. : 3 Send Just mail photo w with name and ad= a Send No Money? dress. In a few days your postman will.deliver a beautiful enlargement thatwillnever: ade. Pay him only ` 49c plus postal fee or send 60c with order and we will pay: postage. ¢ BEAUTIFULLY @ To quickly acquaint new custom- h th igh h f Carved Frame EREE? croy: os ich Gnat or go 4. neice. gtico, all Pastel Colored enlarge enlargements FREE. Iligatratione of beau- . .tiFilly carved frames from whicb to make a choice will be sent uh - Your enlargement. Don't delay. Act now. Mall your Photos _NEW ERA PORTRAIT COMPANY 22 E. HURON STREET = DEPT. 612 CHICAGO, ILLINOIS bers to lift river be bars? ı MULTIPLY and DIVIDE 5. Easily « Accurately « Quickly The Math Pony is a dictlonary of numbers. To Multiply—add. To Divlde—subtract. For Students, Business Men, Homes, ete. Abso- lutely accurate—more so than a Slide Rule, Simpler than a Log Table. Saves time, errora and mental ef- a fort. Essential as a Dictlonary. Paya tor itel In aehort time. 90.000 produeta— 212 Dages—-sewed bi ens HEAVY PAPER COVER $1.00, "ART EABRIKOID COVER isemi- Aerie $1.50. Agents wante; MATH BONY PUE GO” Bex 1510.D, Milwaukes, Wis. "e" BROADCAST? Ir you have talent here’s your chance to get inlo : Broadcasting. New Floyd Gibbons method trains 8 What is you for the job you want, You learn at home in a f 9 sparo time. Tascinating course fully explained in orm : Treo Booklet, ‘How to Find Your Place in Broad- casting.” Send for your copy today. Give oge. FLOYD GIBBONS SCHOOL OF BROADCASTING 9 Why does the Patent Office ad- 2000 (4th St., N. W., Dept.4H42, Washington, D.C. s vise applicants to employ reg- B e a Real istered patent attorneys ? z When can an article be marked if r rafts m a n l 10. “Patent Applied For”? Drafting is fascinating, well- 7. Record of Invention” paid work, with many oppor: tunities for advancement. ioe becomeareal Draftsman in = cars of less, through home & For the answers to these ques se dy in spare time. at specially pre- tions and other information of pared by 37 e: rts noted En: neers, value to you, look on page 138 house, General Electrie, Cutler-Hammer, ete. COPYRIGHT CLARENCE A, O'BRIEN —and well-known Educators. Complete employ- ment service jocladed. Send for- Free Bulletin: TODAY. No obligation. American School, Dept. DD28, Drexel at S8th, Chicago Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers 33 Architects, and Designers from- Westing- |

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„e! MY FLIGHT VER since the first stratosphere ascen- sion of my brother, Auguste Piccard, I have been asked these questions: — i “What about going still higher than the stratosphere? What about going beyond the carth’s atmosphere? What do you think of week-end trips to Mars or a sight-seeing flight through the rings of Saturn?” Eventually I believe it will be possible to circle the earth in two hours at an altitude - where there is no air to interfere with one’s motions. However, as to interplanetary travel—well, let us begin at the beginning: It is strange to say, but half an hour from here there is something like an entirely new country. Stratosphere is the name given to it. It is the upper part of the earth’s atmos- phere, the region of eternal cold. It begins about six miles from the earth’s surface, and the air of which it is composed is too rarefied to sustain human life. So far, men have gone into the upper strat- osphere only by means of balloons. No bal- loon, no matter how great its buoyant pow- er, can go beyond the stratosphere, because a balloon is lifted by the surrounding air. However, there is another method of loco- motion which does not depend upon air— that is the rocket. The rocket supports it- self by throwing off the products of combus- tion. A simple calculation shows that a Photo shows take- off of Prof. Auguste Piccard on world’s first stratosphere dight. This scene will be . duplicated this summer in De- troit by the famous acientist’s brother, Jean, the author of this unusual story. . Prof. Auguste Piccard is shown with an assistant inside the aluminum gondola of the balloon which carried him to a height of more than ten miles into the stratosphere. Prof. Piccard was the first to invade the stratosphere. 34 Modern Mechanix-and

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into the STRATOSPHERE Interplanetary Flight Y BREAKING down matter, transforming it into light and utilizing the resultant energy, man may make a round trip to Mercury (57,000,000 miles distant) on about 110 pounds of lead, according to news interviews with Prof. Auguste Piccard. ‘Explosive fuels for interplanetary travel, however, offer difficulties. Moon-bound projectiles would re- quire an initial velocity of 24,000 m.p.h., fired from a gun barrel al- | most 2,000 feet long. Moon rockets }-would need 20 tons of explosive. To avoid a smash on landing, another 20 tons is necessary to brake. the . rocket. | Ha, 800 FT a Mi HEIGHT. ATTAIN= EO BY SHELL OOF, PARIS. GUM COSMIC RAYS 100. TIMES STRONGER - THAN AT. EARTH'S SURFACE o | my 3 MILES. EA = 50% OF AIR MASS BELOW THIS POINT ERE PRERE {TEMPERATURE DECREASES AS ALTITUDE IN« “CREASES s) Man’: s conquest of space abd the hardships he n must endure, Greatest height e thrown.. by.. the Paris ‘gun. ith the inctease' ‘in! height. are graphically shown in drawing above. reached :.was: th: Note. how ait Inventions fop.. Awgu st To be the first licensed woman balloonist and first of her sex to enter the stratosphere, Mrs. Jeannette Piccard, wife of the author, is taking balloon lessons, preparatory to piloting her husband into space. Above, left to right, Mes. Piccard, Professor Piccard and the instructor, Edward J. Hill, noted Detroit balloonist, on a recent trial flight. rocket can easily contain enough energy to go beyond the stratosphere, say 100 or 1,000 miles from the surface of the earth. The cal- culation also shows that from a purely ener- getic point of view, a rocket might contain enough fuel to leave the. neighborhood of the earth altogether, and visit our most dis- tant sister-planets: Such a flight to another planet would be theoretically possible bit exceedingly diffi: cult. And:a return flight would probably be impossible. In the present” state, of- our knowledge, it is useless even to discuss inz terplanetary travel as .a practical. thing. New sources of energy will first have to be tapped—sources related to the vast energy given off by radium and other radio-active substances. Physicists have just begun, less than a year ago, to create artificially, minute amounts of radio-active substances. If one could produce large amounts of these sub- stances—say, put them on the market in lots of half an ounce—then it would be time to talk about: interplanetary travel. It is 35

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Daring Men Probe Stratosphere Mysteries in a Series of Record Flights

Captain Albert W, Stevens, left, and Major William E. Kepner test a safety compression valve in preparation fer the Army-National Geographic stratosphere flight. not likely that any of us, even the child born today, will still be alive when some “Lone Eagle” of the future will come back with a close-up photograph of the canals of Mars. The rocket is now at about the point where the automobile was when it was dis- covered that a mixture of air and gasoline explodes with liberation of great energy. We know the power which will eventually send passenger rockets above the strato- sphere, but we have yet to build the rocket. We have yet to invent the right kind of “carburetor,” the right kind of < ‘steering wheel,” the proper “differential, ” and all the various parts of a practical: machine. In other words, the possibility of rocket flying is still remote. But investigation ‘of the stratosphere, itself, presents enough problems to keep us occupied fora long time, without going beyond the earth’s en- velope of air. . One of the more consérvative questions asked me is the possibility of airplanes fly- ing through the stratosphere.’ Will it ever be practicable? Certainly, it will. ‘As a mattér 36

Left, Commander. Settle and Prof. Jean Piccard exam- ine the gondola in which they were to make a flight last year. The flight was canceled but the gondola will be used on Prof, Piccard’s newest venture. Right, Dr. W. F. G Swan, of the Franklin Institute, Swarthmore, Pa., checks over the cosmic ray apparatus to be used by. Prof. Piccard.

of fact, it is entirely possible now. Some pilots have already taken airplanes into the lower levels of the stratosphere. But their airplanes were not equipped with airtight cabins like the gondola of a stratosphere balloon. To fly in the stratosphere, even in its lower levels, without an airtight cabin means a terrific strain on the pilot, a strain which easily spells death. But the airtight cabin invented by my brother, Auguste, when adapted to the air- plane will make stratosphere flying as easy (Continued on page 128) 1934 Stratosphere Flights KEPNER-STEVENS—Major William E. Kep- ner and Captain Albert W. Stevens seek 15- mile record in a flight sponsored jointly by the Army Air Corps and the National Geo: graphic Society. Take-off in Black Hills, near Rapid City, S. D. WILEY POST—Plans 55,000-ft. climb in his: globe-circling monoplane, “Winnie Mae,” newly equipped with. special supercharger and extreme variable-pitch propeller. Since pressure at sea level is 15 Ibs. per square inch inside and outside body but only 3 Ibs. out- side at 40,000 ft., Post uses a special rubber- ized suit which presses down on body, equal- izing the thinning pressure. PICCARD—Prof. Jean Piccard and wife, Jeanette, plan flight from Detroit, described in this article. SOVIET RUSSIA—The “flying armchair,” in which a pilot dressed in deep-sea diver’s suit and breathing compressed air, will ascend, seated in a tiny, open cage surrounded by in- struments. Plan is to cut balloon loose and . déscend in parachute. - — PARIS-NEW YORK PLANE—A itratosphéte airplane under construction which will-make ‘the hop; Paris to New. York, in. eight hours.:

‘Mo'detn* WeeRaniz "and

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French Airmen Span Atlantic to Inaugurate 1934 Season Scene at Floyd Bennett field, New York, as monoplane Joseph Le Brix came to stop after 381 hour crossing from Paris, Weakened wing guy wires caused premature landing. APTAIN MAURICE ROSSI and Lieuten- ant Paul Codos, holders of the long dis- tance flight record, were the first to cross the Atlantic in both directions when they completed a flight from Paris to New York recently. They had planned a nonstop flight to San Diego, but wing trouble forced the landing in New York. Other New Air Records The S-42, largest flying boat built in this country, climbed 21,800 ft., a record for altitude with a pay load. Jack Frye, veteran airmail pilot, recently zoomed across the continent in 11 hours, 31 minutes for a new cargo plane flight record. Jean Batten, New Zealand girl flier, soloed from England to Australia in 15 days for a new women’s distance record.: Tiny Motors Made From Iron Pipe pee building of tiny electric motors from odds and ends of wire and iron pipe is the unusual hobby of W. S. Yikes, a Minne- apolis M-M reader. Although only flashlight cells are used for power, the mid- get motors de- velop a surpris- ingly high speed. Pipe lengths of various diam- eters are used for the field frames. Motors and cells are mounted neatly inahinged box. A double. - throw switch ‘controls motors. Tiny motors made of scrap parts. drive fans, midget power saw. Inventions for August ~ 4 Captain Maurice Rossi (left) and Lieutenant Paul Codos, French air aces, first to cross Atlantic in both directions, Ash Tray Man Blows Out = OUCH a lighted cigarette to the mouth of this gro- tesque little ash tray man, and he will instantly ex- tinguish it with one drop of water. The man must occasionally be filled with water. The head comes- off for refilling. . Grotesque figure blows water bubble, extinguishing ette held up to cigar- its mouth. 37

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Electrically Driven Bellows Keeps Man Alive Two Years AGING a grim battle against nature ‘with a human life at stake, scientists in London, England, have been successful in preserving the vital spark in a man doomed to death more than two years ago. A-remarkable mechanical device which was especially invented for his use has kept the Englishman alive through the agency of prolonged artificial respiration. Electrically driven, the apparatus con- veys, through a wide band encircling the patient’s chest, a rising and falling move- ment which simulates normal breathing. One of the triumphs of modern medicine, the life-saving machine was invented, after considerable experimentation, by Sir Wil- liam Braggs and developed into its present successful state by R. W. Paul. Said to be the world’s largest passenger-carrying bus, this huge machine transports 150 workmen on each trip between Boulder City and the site of the Boulder. Dam. Trailer Truck Delivers New Cars NEW fleet of haulaway trailer-trucks has recently been put into commission by the Ford Motor Company. Completely enclosed, the trailers are desigtied to elimi- nate possible damage to new cars, formerly delivered under their own power. ` The trailers are constructed of dowmetal, a magnesium alloy which is lighter in weight than aluminum yet as strong as steel. Although the trailer is completely enclosed against the weather and is twelve ‘feet high and ‘forty feet over all, its total weight is said-to be only 4900 pounds. This’ lightness permits truck speeds of fifty miles an hour, thus ensuring rapid delivery: Designed - to safeguard new automobiles: in. transit, : this special haulaway trailer delivers. cars in the same condition | as when they left the assembly line in the automobile-factory. 38 Photo shows man wearing the apparatus invented by English scientists which has kept him alive. for more than two years. Artificial. „Tespiration is supplied by the machine. Huge Bus Carries 150 Passengers ‘ACED with the problem of transporting the army of workers employed on the Boulder Dam project to and from their daily tasks, engineers constructed the largest passenger-carrying bus in the world shown in the photo at left. A- double-decker, the vehicle carries 150 workmen on each trip. between the dam site and their living quar- ters in Boulder City. German Invents “Flying Bicycle” . Built by a German. flying fan, this motorless plane depends upon an ordinary bicycle to furnish power for the takeoff. Total weight of the plane i is less than two hundred pounds. HE latest development of foreign aviation enthusiasts is a “flying bicycle” built by a retired police sergeant at Adlershof, Ger- many. The machine, which is in reality a bicycle-powered glider, has a wing spread of about 26 feet and a total weight of about 90 pounds. The struts and braces are-built of Canadian fir, with an ordinary bicycle serving as the plane’s undercarriage. A system of levers permits the bicycle- pilot to guide the strange craft.in flight, and «an elaborate set of: rounded braces serves ‘as a landing gear. os .Modern Mechanix-and

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SBoat “Building CLUB Gets CHARTER in SOCIETY of Mechanix and Jnventors The HI-N-DRI Yacht Club, of Los Angeles, is Charter Club No. 12 in the International Society of Modern Me- chanix and Inventors. Some of the members are shown above, Others were cruising at the time photo was taken. HE HI-N-DRI Yacht Club of Los Angeles is the largest club to receive a charter thus far in the International Society of Mod- ern Mechanix and Inventors. The club was granted Charter No. 12. It has more than fifty members who are chiefly interest- ed in boat building. Sixty-two clubs have been organized and have applied for charters since the organi- zation of the International Society of Mod- ern Mechanix and Inventors. At this writing clubs have been formed or are being organized in 23 states in the United States and in three provinces in Canada. The HI-N-DRI Yacht Club has a very sig- nificant and original burgee which is used on all its boats and on its stationery. A letter received from David S. Forsyth, Com- modore, says in part: The club was founded to promote and as- sist in the building of boats, which explains the saw-horse on the burgee. Eighteen of our present fleet were constructed or rebuilt by the owhers and their crews. Of this number six are Modern Mechanix designs. Four boats are under construction at present and a 37- foot cruiser is being rebuilt by our Rear Com- modore. : The two copies of “How to Build Twenty Boats” in the club library are out more than in, The members have found the construction details helpful on other boat problems, As stated in the June and July issues of MopERN MECHANIX AND INVENTIONS anyone Inventions for August Flag officers of the HI-N-DRI Yacht Club (shown above) are, left to right: Rear Commodore Leo V. Thomas, Com- modore David Forsyth, Vice-Commodore Russell Forsyth, and Fleet Captain J. Robert Donley. Note novel insignia. interested in the many activities in the fields of science, mechanics, inventions, or the workshop can organize a club and apply for a charter from the International Society of Modern Mechanix and Inventors. The Society does not levy dues, but membership is limited to subscribers to MopERN ME- CHANIX AND INVENTIONS, the official maga- zine of the Society. Members of the Society can subscribe to the official mazagine and obtain workshop blueprints at a discount. Requests for ap- plication blanks should be sent to the Inter- national Society of Modern Mechanix and Inventors, care of MopERN MECHANIX AND INVENTIONS, 529 South Seventh Street, Min- neapolis, Minnesota. 39

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Flaming dynamite and exploding mortars are the chief tools of the fireworks expert. In this vivid, intimate story one of the aces of the fireworks army takes you behind the scenes to reveal, for the first time, the thrills and dangers of his roaring trade. r pager y PAUL PADDOCK ‘7 ots of Americans thrill yearly to the glittering wheels, flaming rockets and spectacular bombs of the giant fire- works displays; but the men who fire them are the men nobody knows—the world’s most mysterious showmen. | How does it feel to walk among the flaming sets and exploding mortars during a big display? What are the real dangers of this roaring trade? What is the strange, unexplainable lure of a profession that re- quires toying with tons of explosives to give the crowds a flaming thrill? Art Briese, for nineteen years an expert pyrotechnician for Thearle-Duffield, re- cently revealed the mysteries of his calling to an investigator for MoDERN MECHANIX ‘AND INVENTIONS. Briese has personally blown millions of dollars worth of fire- works into blazing ruins; he’s touched off ‘enough powder and dynamite to blow Pike’s Peak into fragments; and he’s come through his.exacting-job with injuries no more se- rious than scorched‘hands_and a current-én-. 40 TIME FUSE IGNITED BY LIFTING POWDER - LIFTING POWDER POWDER EXPLODED ——— BY TIME FUSE STARS CAP BLOWS OFF AT TOP OF FLIGHT = MORTAR Top drawing shows cross section of giant rocket that dis- charges star showers., Below is mortar and bomb which is divided into sections holding the different colored stars. thusiasm for his work that’s as keen as the day he got his first stick of dynamite to bore. “One of the important things to.keep in mind about fireworks,” said Briese, “is the difference between display work and.the over-the-counter business—that is, the sale of firecrackers, pin wheels, rockets and the like to the consumer. Accidents are far less frequent in display work because trained men do. the firing. “The noise-makers are. the most danger- ‘ous: pieces. .:In fact, a stick of dynamite is about. the: most ‘Hazardous unit we emplay. Modern: Mechanix~-and

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Of course, when this is handled properly, it’s safe. “We don’t use much dynamite in the aver- age show. At the Century of Progress, for instance, it is forbidden because the shock would be harmful to fish in the Shedd Aquarium. In shows where dynamite is used the sticks are fired electrically. They are suspended a few feet above the ground and carefully isolated to prevent damage. These shots and the big bombs we call ‘ballyhoo.’ The bombs are fired from mor- tars, steel cylinders buried up to their necks in the ground. Workers are protected by a barricade consisting of a 12” x 12” timber or a telephone pole to prevent danger in case a bomb -is detonated in the mortar. The firing fuse lies out over the barricade where it can be ignited easily without get- ting too near the mortar. This fuse ignites a charge of powder at the base of the bomb, literally pushing it into the air. The explo- sion comes when a time fuse, already ignited, reaches the powder charge. Guarding Against Accidents “The worst accidents in the fireworks business occur at the factories but they are rare now. Only small quantities of material are handled at a time and most of the work is done in isolated sheds, spotted over a wide area. These sheds are of flimsy con- struction. If an explosion does occur, the Top photo shows workman fashioning rattan outline of Barney Google for fireworks set piece above. At right is artist’s drawing of Fort Mc- Henry which workmen fol- low in placing rattan and fire lances on 5x10 foot frames covering 1000 square feet. Inventions for August Al

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Fast Rockets Are Used for Water Fireworks; How Sets Are Assembled Water fireworks are a new development. They are produced by tiny rocket cars that speed 600 m.p.h. over the water. walls and roof give way, reducing the shock to any persons inside. The big display sets with all their sparks and fire may look haz- ardous but they are not as dangerous as the simple sticks of dynamite and the bombs. A big display may contain a ton of material but only 300 or 400 pounds of this may. be explosive powder. Chemicals make up the balance of the material; and whereas they’ll burn, of course, they won’t explode violently. How Displays Are Fired “Shooters wear no special safety equip- ment; not even goggles. The firing is done with a ‘port fire’ a five-foot flare made of two rocket sticks spliced together. It burns about five minutes and gives plenty of brilliant light so the operator can: see the ‘match,’ or fuse, where the piece is set off. Sometimes part of the set doesn’t go off because of a broken connection. We keep watch for this and reach up with a port fire and start it going. Any part of the set can be fired as long as the fuse can be reached. This burns rapidly. In a few sec- onds, it ignites the entire piece, firing the little fire pots or lances that are attached to the rattan backing with which the designs are traced on the set. “Big pieces are made up of wooden frames or sections. The rattan design is placed on at the factory and the frames with the necessary lances are shipped to the scene, The operator’s job is to assemble the sections, join the fuses together, or ‘cut them in,’ as we say, and, of course, fire the set when the proper time comes. “A big piece like the ‘Chicago Fire’ made for the'Century of Progress contains 500 frames, is 700 feet long and from 20 to 65 42 Photo above shows huge pinwheel under construction. The fire lances are connected with fast burning fuse. These workmen are putting the frames together for a set. The two in center are attaching rattan holding fire lances. feet high. The popular ‘Bombardment of Ft. McHenry’ set takes 1,200 feet of fast- burning fuse, 2,880 color pots or lances, 80 pounds of chemicals and powder, 1,200 feet of pliable rattan and over 1,000 square fect of frames. “Thrills?” Briese smiled. “What gives the crowd a thrill is pretty much routine to us. The shooters can’t really see the fire- works with their faces right up against ’em but there’s a lot of satisfaction in getting a good show together, licking all the problems that come up and then having people say it was swell. We get the news even if we don’t come down to the footlights! “Want to know what we’re most afraid of? Rain! A few little innocent raindrops trickling out of a cloud will scare a ‘shoot- er’ more than a whole carload of bombs. Rain may mean a big loss of fireworks, and an expensive delay. We frequently carry rain insurance to protect us against these losses. “Getting helpers on the job is one of the big problems but we have solved it preity well by always having an expert to take charge. (Continued on page 118) Modern Mechanix and

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RADICAL Streamlines Feature 1935 Car ENTERING the greatest width and height through the front seat, the new 1935 automobile, reported as accept; ed by one of the industry’s leading manufacturers, sets a new style in modern stream- lining. The new design places a three-passenger seat in front, with accommodations for two persons in the rear seat. This arrangement permits a con- verging sweep toward the rear in a graceful taper to the “fish tail” stern. Hitherto, the width of the rear seat necessitated an unusual extension of the body to achieve streamlining. An important safety feature of the. new car lies in the ex- pansion: of the field of vision from the driver’s seat. The body lines converging toward the rear per- mit the diagonal placing of a window in the usual “blind” spot. The windows throughout the car drop completely out of sight inside the doors. Vertical “Oars” Propel New Boat By means of a simple hand apparatus the occupant of this new German boat is able to move his vertical “oars” through the water without the labor attached to conventional rowing.. IALCULATED to reduce rowing labor, a Jnëw boat has recently appeared in Ger- many. Instead of the conventional oars, twin paddles, mounted vertically.. and moved by asimple hand apparatus, are used to propel the craft. Considerable speed is attained without tiring the rower. Inventions for August These photos of the 1935 automobile illustrate the radical lines employed to effect streamlining. how range of vision is broadened.. Windows drop completely out of sight. Note how seats are enclosed within wheels and Portable Fan Operates By Hand HAND - OPER- ATED fan, now available, is the newest device for promoting hot weather comfort. The four-bladed metal fan is set in operation by an up-and-down pres- sure of the thumb on a lever which engages a ratchet gear, turning the blades at a rapid rate. Pressure upon thumb lever op- erates ratchet to drive blades. Burner Destroys Roadside Weeds N atomized fuel-oil burner has proven successful in destroying weeds along railroad right-of-ways and highways. This weed burner may be operated along railroad tracks, highways or in fields. Operator controls size of flame. 43

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Trains Bugs, Flies and Spiders for Moving Picture Work Syd Fogel, trainer of insect actors for Hollywood movies, is shown training a lazy tarantula to do a bit of high jumping through a hoop for a forthcoming mystery picture. Safety Wheels Aid Bike Novice S A double concession to small boys who want to ride a bicycle and to par- ents who are afraid to let them try, lest they get hurt, a new safety bike has recent- ly been placed upon the market. Two small safety wheels attached to the rear axle give the bicycle the same stability as that of a three-wheeled velocipede while the youngster is learning to ride. When the beginner has had sufficient practice, a lever in front of the seat may be shifted forward, raising the safety wheels from the ground. Two safety wheels attached to the rear axle of. this new bicycle make it safe for the youngster learning to tide. The lever, mounted forward of the seat, may be shifted, taising wheels from the ground to form an ordinary bike. 44; ANDIDATE for the strangest job in Hollywood is Syd Fogel who grooms and trains flies, worms, spiders, beetles and every variety of bug for the motion picture cameras. A bit of syrup holds Fogel’s “actors” in a given spot while thin trails of their favor- ite foods induce them to walk, run or fly in a definite direction. Flies are- made to light and clean their wings, feet and feelers by spraying them with glue. Fogel has made a thorough study of the habits of the various insects and adapts these to the needs of the picture to be filmed. The creatures are held on long leashes made of thin hairs and are always put through their preliminary paces before the cameras are turned over. Fogel’s trained insects are greatly in de- mand, with the result that he is kept busy the year ’round at his strange trade. Braves Sea Perils in Tiny Boat Ta this 14-foot craft Paul Neuhaus, of Los Angeles, matched wits with Neptune in a voyage from California to New York, RAVING the perils of the deep in- the world’s smallest ocean-going craft, a Los Angeles adventurer recently put to sea, bound from Santa Monica to New York City: The:tiny vessel is only fourteen feet long, nineteen inches wide and four inches deep. A ten foot sail supplies the motive power and twin pontoons, nine feet long, eight inches wide and five and one-half inches deep support the craft. Modern Mechanix and

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Riding Mot (0: ‘Broncos | Roaring across ditches and up impossi- ble grades, motorcycle hillclimbers ride the most dangerous race course in the world. In this thrilling story the national champion takes you for a breath-taking ride up the practically vertical speedways. pe hundred and fifty feet from the start on thè tricky hill at Huntington, West Virginia, my motor suddenly leaped out from under me. On each side of the 20- foot course onlookers strained forward, ex- pecting to see the-machine. crash down on my broken body, thus bringing toan em- barrassing'ċlose:my vain effort to ride over the:erown of the hill. The motor had “too much gear” and as I screwed.on the power, the rear wheel pushed its way forward, the front wheel left the: ground and for a split-second I was standing. there, supporting the machine directly over my head. I held onto the bars, not wishing. to turn my mount loose on ihe crowd, pulled it: around overhead and forced the motor to: land on the wheels. Meantime I cut off the power. As it came back to earth I jumped on and rode, as sedately as a thwarted hill- climber can retreat from defeat, back down to the starting point. Thrills of the Vertical Speedways Motors loop the Icop, dig their own graves on sandy hills, leap sideways as they bound over rocks, ‘stall‘on particularly steep grades, leap into the air and sometimes land on their riders, crushing their arms; legs’ or ribs;. Yet despite the ever-present dan- gers; professional mountain goats return each year for more thrills, hoping to roar: over one more stubborn hill before turning their: mounts out to pasture, in some a yard. ` Thrilling business this! Race courses from 100 to 600 feet long—grades as steep as'80 per cent—double hills—rock ledges to hurdle—ditches to jump! - For thirteen years I have been riding in professional motorcycle races. The biggest thrill: I have yet had is the: winning of.a national hillelimbing championship. Through'a combination of good equipment and. skill, I won the title in.. 1928, 1929, 1932 and 1933. This-year Iwill seek the [i JOE PETRALI championship again by riding. weekly, until i September; on- hills scattered from. Gali- National Hillclimbing Champion | fornia to Pennsylvania: cin guen ts poe tam: Pe Gee Ros aneda Ie Kaventions -for August 45

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AMERICA’S NATIONAL ‘CHAMPION REVEALS There are many fine tricks—from proper carburetor adjustment to selection of chains —that have enabled me to ride to several championships. In my shop at Glendale, California, I prepare my equipment for summer events, but only after many experi- ments do I decide on the exact equipment and method of riding to use on a particular hill. Unhappy and sometimes painful con- sequences result from using improper equipment. If the motor does not loop when a rider pours on the power, it may jackknife, caus- ing him to catch a heel in the chain. Only skill as the motor jumps over rocks and digs its way down into soft spots can keep the machine on the straightaway and out of the crowd. Mechanical Aids to Victory I do not count so much on my skill to bring me through to a victory as I do upon three mechanical factors: -carburetor set- ting, proper gear ratio and chains on the rear wheel. In no form of racing does vic- tory depend more on how we use our fuel and how the machine responds to the con- trols. The slightest variation in the fuel supply makes a tremendous difference in the sen- sitive motor. If I want to hurdle a ditch, I pour it on and take all the speed and drive I can get; on the other hand, if the front wheel shows a tendency to leave the ground or if the chains are biting down into soft dirt, I retard the throtile a little. The proper fuel combination is highly important. I have found a mixture of three- pac ET “46 fourths alcohol and one-fourth benzol gives the greatest power and pick-up. The high speed carburetor adjustment is likewise important, requiring one full turn on the needle beyond the setting for gasoline to make the mixture rich enough. Alcohol- benzol is heavier than gas. You can have a lot of sport riding your own motor up neighborhood hills, but if you want to get the best from your engine it will be a good idea to keep a record of all carburetor adjustments and the results . in speed and power from each setting. From this you will learn how to handle your own motor. I always take this precaution. Generally speaking, you should retard the spark and cut down on the high speed valve until the motor sneezes. Then come back on the valve until the motor will just take acceleration. With advanced spark the -motor should be basically right, although you will need to make additional adjust- ments to suit conditions and: your individ- ual style of riding. Do not underestimate the importance of chains. In my supply are two kinds. One is a Weed chain with loose overlapping links of the same type; the other is motorcycle chain with loose overlap- ping links of Weed. The first is best, & and Modern Mechanix

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THE THRILLS AND SPILLS OF HILLCLIMBING. : Hillclimbing Facts ‘Weight of motorcycle—316 ibs. Piston displacement—45 cubic in. . ‘Speed of the motor-—6,000 r. p. m. ‘Crankcase lubrication—castor cil. Fuel—alcohol, 34; benzol, 1⁄4. Length of hills—100 to 600 feet. Length of the take-off—25 feet. : Steepness of grades—50 to 80%. Taking off from a level start never more than 25 feet in length, hillclimbers must hurdle ditches, scale rocky ledges and keep. their mounts level on an 80 per cent grade. Photos show how last-second disaster often cheats the rider. -adapted to the soft or sandy hill and the latter seems best suited for a hard surface. More than once I have beaten a rival be- cause he used the wrong type chain. Had my competitor done as I did—tried out both kinds on all types of hills—he might “have fared better. `v. In the west I use the motorcycle-Weed ` combination, generally speaking, while I usually? equip with Weed only-in the east. | The Muskegon, Michigan, hill illustrates the néed' for ‘all-Weed. This is a rather sandy. climb. In practice rides last year I found the sharp edges of the motorcycle chain dug a grave for the rear wheel and left me standing near the foot of the hill. When I changed to the other type, the loose links piled up onthe tight links, giving me nearly an inch of projecting chain to better my. -traction which enabled me to climb easily. to: ‘the ‘top. . -Selection of a proper gear ratio is one of the secrets ‘of successful hill climbing. If you:have too low.a gear your motor. may : leap out from ‘uiider you; if: you have too high a gear your motor will stall.- In the > (Continued on page 120)" tEnventions ‘for -August : AF

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Australians Ride Side by Side on “Bicycle Built For Two” These cyclists seem to have no trouble balancing on this “bicycle built for two”—but is it as easy as it appears? Note ingenious coupling of the two handlebars to front fork. Aluminum Boat Weighs 30 Pounds EIGHING but 30 pounds, a novel boat having cast aluminum ribs is claimed to be the lightest of its size and capacity in the world. The boat is designed for either hunting, fishing, camping, or sailing. The sail rig can be attached in a few minutes. This boat was recently placed on the market in construction kit form and also as a completely assembled unit. Hunt, fish, camp, or sail with this 14-ft. aluminum rib boat. Complete boat without sail rig weighs only 30 Ibs. Craft will carry two men together with camping equipment. 48 N Australia an odd “two-seater” bicycle has been invented by Hubert Opperman, famous distance cyclist. The seats are fitted side by side instead of the tandem style commonly used. Two seats, two pedal hang- ers, and two handlebars are mounted on a frame made of steel tubing. An extra sprocket is added on the rear wheel. Both handlebars must be turned to steer the bicycle. l Tap Pipe Easily With New “Tee” NEW “tee” now makes it possible to tap pipes in less than 6 min- utes, without even shut- ting off the gas or water. The “tee” is a saddle which is bolted securely to the pipe. A hole is then drilled into the pipe, and a plug or new connect- ing pipe screwed in place immediately to prevent any escape of gas or wa- ter. With this saddle, pipes can be tapped easily in six minutes. Guards Adopt Rubber Life Floats Capt. George Watkins (left) displays rubber rescue tube he invented; Lieut. Pearson holds old type metal float. UBBER rescue tubes intended to be thrown out to swimmers in distress are now being adopted by life guard stations on Southern California beaches. The 42 inch long heavy rubber tubes weigh only ten ounces when completely in- flated to two pounds air pressure. They will support 50 pounds dead weight, or a 200 pound man. The soft rubber tubes are much easier to tow out to a rescue than the old metal type. As many as four floats may be taken out by one guard. The old metal “cans” have been known to bounce around and hit rescuer or rescued on the head in a heavy sea. Modern Mechanix and

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New Chicago Stockyards To “Be Fireproof. The nine story Exchange Building Only twisted steel girders remained of shown here was the tallest structure destroyed in Chicago’s recent fire. ` RIVER. of water 4 feet deep, 50 feet wide and 15 miles long was required to bring under control Chicago’s greatest fire since the disaster of 1871. In all 120,000,000 gallons of water . were pumped over the 80 acres tha: were burned in the recent Union Stock Yards fire which de- stroyed property to the value of $10,000,000. Bringing the fire undėr control was not entirely a triumph for modern fire fighting methods. It took 3,000 firemen, 138 fire com- panies from all of Chicago and many of its suburbs, 41 hours before a shifting the amphi- theatre where stock shows were held. wind. came. to the rescue. The conflagration, how- ever, did bring out strong- er than ever the necessity of fireproofing in large cities. As a result the latest prin- ciples of fire prevention were employed in the reconstruction that took place as soon as workmen could enter the burned over area. Steel and concrete pens, silos, load- ing chutes and runways will replace the wood framework that was wiped out.: Despite the fact that 113 buildings were destroyed, business was carriéd on as usual. Temporary offices were set up; six hours after the fire was out, in emergency shacks, on the sidewalks, and in box cars où Fail road sidings. f Science was called to the rescue tö' help liventions “for *Awgust An aerial view of the gigantic blaze sweeping towards the World’s on Lake Michigan. Fair grounds Photo was taken before Exchange Building caught fire. rediscover the valuable records that were destroyed in banks, exposition buildings, and offices in the fire area. In the charred ruins investigators sought and carefully pre- served the crumbling ashes of burnt paper. By means of infra-red photography experts will be able to bring back many records. Fortunately. duplicates of precious rec- ords of prize cattle were found intact in a vault five’ days after the fire. -In another case valuable bank. papers and currency in.-a. vault that had béen heated to a white hot mass were found in good condition. Safety deposit vanljsi in the banks v were. only slight- ly damaged. © ees = 49

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“Problems of STAGING a WAADISON Square Garden’s Long Island ` Bowl in New York, scene of the Primo Carnera-Max Baer heavyweight champion- ship fight, is a triumph for the science of outdoor sport dramatics. Behind the scenes of this world’s championship match ‘are the latest mechanical marvels and an or- ganization of showmanship, surpassing all previous open-air spectacles in the boxing business even in the days of the great Tex Rickard. ` Engineering geniuses of the Madison Square Garden Corporation, headed by Lionel Levy, famous architect of the Long Island Bowl, made improvements in the bowl after a careful survey of conditions Putting on a big fight for throngs of 72,000 and the anxious outside world calls upon all the ingenuity of showman- ship. How Madison Square Garden, of New York, does it is described here. during the Jimmy McLarnin-Barney Ross welterweight championship fight in May. The technicians regarded the prior show as “a dress rehearsal,” and all details of lighting, seating, vision, and safety were checked over with penetrating caution, to ‘insure the success of the heavyweight title fight. The lighting effects are under the direction of Frank Niskern, an engineer formerly with the General Electric Company, but enticed into the outdoor enter- tainment business by Madison Square Garden. It was Niskern who improved lighting arrange- ments after ringside sports writ- ers protested that the heat from scorching ring lights made their work unbearable. Ac left is a closeup of the ring under con» struction. Forty-five 1,000-watt lights are hung in the framework to which is also at- tached batteries of megaphone loudspeakers. Looking down from the bleachers to the. ring the two elevated platforms for newspaper and’ newsreel camiéramen g a ate plainly visible. Because of the 1,000-watt isr 50- hts sports writers seated at the ringside suffered: -ĉroni intense’ heat. Modern Me chanix and

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by C hampions hip Chig ht ALFRED ALBELLI A staff of more than 1,500 is needed to control throngs of 60,000 to 72,000 persons attending the big fights. Here is an air view as crowds. filled the Long Island Bowl for the Jimmy. McLarnin-Barney Ross welterweight match. Forty-five 1,000 watt electric lights were suspended 15 feet over the ring during the McLarnin-Ross fight. Before the heavy- weight fight Architect Levy summoned pho- tographers and newspaper reporters to the Madison Square Garden Bowl and they were directed to assume their places. The cam- eras were placed on stands 25 fect from the ring. : These stands are steel towers, elevat- ed above the ringside seats. - After considerable experimenting, Levy and the photographers agreed that’a height of 22 feet was practical and saved the news- paper men from scorching heat. The engineers then checked up on the loud-speaker system. Four highly sensitive -microphones were suspended 15 feet over the center of the ring and connécted to loudspeakers posted at the four corners of the framework holding the lights. An ‘électrical network in turn reproduced announcements by means of amplifiers scat- tered throughout the arena. The outside world was not forgotten by the Madison Square Garden Corporation. Telegraph keys were posted beside each reporter’s seat so that sportswriter and telegraph operator could work rapidly ‘without interruption. Special telephones were installed, contacting the reporter at Inventions for August Problems that came up during the McLarnin-Ross fight were solved before Primo Carnera (left) and Max Baer met for their heavyweight championship battle in the big bowl. the ringside with his distant newspaper editorial room. Another innovation was the telephone system from the ringside to the dressing- rooms where opponents and their handlers were notified when their bout was to go on. By a re-arrangement of the sealing plan, so that only one inch was subtracted from the space between rows, Levy was success- ful in increasing the seating capacity from (Continued on page 121)

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peeved on Stilts Simplifies Job of Reaching High Ones NEW twist to an old sport is being introduced by cadets of Valley Forge Military Academy who play baseball on stilts. Each player takes the field with a pair of stilts about five feet long strapped secure- ly at the ankle and above thè- knees. The sport is not without its thrills and spills;.but just what happens when a player slides for home or attempts to scoop up a hot ground- er are matters for conjecture. Club-Weight pave Golf Swing N EASILY at- tached’ weight Which slips over clubs is said to de- velop a proper straightens drives and builds “follow through” action. Weight slips over club-head, tending to perfect the swing. Electric Device Curries Horses Photo shows horse being “vacuum cleaned” with new elec- trical curry comb. Dirt is drawn through hose into bag. CIENCE has abolished the old curry J comb in up-to-date stables with a new electrical grooming device for horses and cattle. The old method, while effective, trans- ferred most of the dust and dirt from the ‘animal to the man. By use of the electrical comb, however, all debris is drawn into the bag of the device, which operates much like a-vacuum cleaner. A thorough cleaning is accomplished in half the time required by the old method. 52 the head of wood. golf swing. Weight Cadets of Valley Forge Military Academy combine baseball and stilt-walking in a game that is replete with numer- ous thrills and spills. Blacksmith Sets Up Shop in Auto THE modern blacksmith is abandoning his stand under the old chestnut tree and is taking to the road with his bellows, forge and anvil mounted in a truck. One of the enthusiastic exponents of the portable smithy is Ed McCaa of Pasadena who goes out after business instead of wait- ing for business to come to him. He has installed a hand-operated blower and a small forge in the rear of his truck. A vise falls into place when the tail gate is dropped and the anvil and its standard are set up on the ground. A big stock of horseshoes is carried in a special cabinet. The portable smithy. shown above solves the problem of shoeing horses on estates located some distances from a city shop. All necessary equipment—bellows, forge, anvil and assorted shoes—is carried in the rear of the truck. Modern Mechanix and

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“Powderless Gun SHurls Shells 100 Niles THEAMOSTATICALLY CONTROLLED HEATING ELEMENTS AROUND BARREL TO MAINTAIN BURSTING CHARGE VAS TO RETAIN HEAT IN EATER UNTIL DISCHARGE UNIFORM TEMPERATURE OF 90°F. LEAD BALLS STEEL TUBE GROUND TO 002" LIMITS CONCRETE PIT 20 FT. DEEP CIRCULAR TRACK, § a 1 JHI TRANSPORTED UNDER SPINNING FRICTION! MOTOR COMPRESSIO! SLIGHTLY LARGE! 3-FINGER PNEUMATIC CLUTCH TELESCOPING SHAFT EXTENDED BY COM~ PRESSED AIR FIRING CONTROLS IEAVILY INSULATED ELECTRIC SUPERHEATER z [oO Se PRNG 4) x ANIF Ty Rae A fil \ J Xai Hl a» W F VALVE HI MECHANISM . AIR MANIFOLD RECHARGE! UNIT FULL PRESSURE FOUR AIR CYLINDERS Mi 15,000 LBS. PRESSURE 30 FT. DEEP X 6l FT DIA. n7 Diagram of proposed gigantic compressed aic gun, with breach block detail at upper right. Bore is ground gtass-smooth, and oiled before each shot. Four air cylinders are used for each shell. Huge proportions make permanent base necessary. Te staggering cost and brief life of the World War Paris guns inspired Hi Sibley, a California inventor, to design a powderless long range gun. It is claimed the new gun will hurl perfectly streamlined projectiles to unprobed heights of the strat- osphere. Missiles of destruction could be dropped on armies and hostile cities hun- dreds of miles away with deadly accuracy. The life of the German long range guns was but little more than one second, but the new pneumatic gun would last indefinitely. There would be no need of wasting thou- sands of dollars in firing other guns each time the long range gun is fired, merely to conceal its position, as was done with the Paris gun. The compressed air gun would make a report but little louder than that of light artillery. Frictionless-metal compression bands on the shells fit to within thousandths of an inch into the glass-smooth barrel of the pneumatic gun. Just before firing, the shell, supported on ball bearings inside the com- pression bands, is started spinning by a high speed electric motor. A clutch on the drive shaft projecting through the breech block grips the tail of the shell, but releases Inventions for August Photograph of one of latest models of compressed air guns, with every bit of mechanism accurately reproduced to scale. Elevating and turning mechanisms are electrically operated. automatically when the compressed air charge is turned on. Even though clearance between shell and barrel is less than that between piston and cylinder in a steam engine, there is very little wear on the barrel. Before each shot the barrel is lubricated with a specially de- signed atomizer spray which travels the en- tire length of the gun barrel. 53

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Radio HUNTERS SEEK Above—The: beach at Cocos Island, goal of the treasure seekers;: showing rude.: shack left by other expeditions, Right——A radio metal finder, similar in principle to that used.. by: the: English gold. hunters. A change in the radio.. tone signal indicates the presence of buried metal. NSWERING the challenge of ghostly buc- . caneers, an English expedition, armed to the teeth with :modern scientific equip- ment, is preparing to lift the world’s great- est treasure hoard—the pirate gold of Cocos Island. _ Lying in the upper reaches of the South Pacific, about 500 miles south by west from Panama, Cocos Island has been the peren- nial goal of treasure seekers ever since the bloody days when pirates roved the tropic waters and hid their booty on the famous isle. ` Hundreds of tons of gold and silver bul- lion. lie buried in the jungle depths of Cocos Island—in fact, well founded estimates place the total value of the long-lost hoard as high as $60,000,000. This.is the treasure which the English expedition hopes to find after countless others have failed. Headed by Commander F. A. Worsley, Captain of Shackleton’s Eudurance in the Antarctic Expedition of 1914-16 and sailing master of Shackleton’s Quest in 1921, the English group is basing their hopes of dis- covering the treasure upon the use of a new scientific machine embodying radio-elec- tric principles. An electric field is set up on the surface of the earth by means of electrodes connected by wires to:a port- able!battery case and a ratiometer mounted on a tripod. These electrodes are moved about to form a rectangular “grid.” Any 54. ] conductor of electricity lying underground: —and gold and silver are among the best conductors known—will show a disturb- ance in the regularity of this grid easily detected through headphones worn by. the operator. Once the presence of the precious (Continued on page 134) Modern Mechanix and

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“PIRATE GOLD Fone atti A Jregsure Nes north of dotted line ~~ The graphic map above plainly shows why Cocos and its surrounding territory are such rich grounds for the treasure seekers. Spanish ships once sailed from Manila to Acapulco, Mexico, with cargoes valued at $10,000,000. Other gaileons, laden with gold and silver, sailed from Arica and Callao to Panama, where shipments were transported across the Gold Road to Porto Bello. Some of these ships were driven on the reefs by storms where their cargoes were lost. Others fell into the hands of Drake, Morgan and Cavendish, who looted them and butied their treasure. Likewise, the Spanish ships plying the West Indies were waylaid by Captain Kidd, Lafitte and Blackbeard. Much of their plunder is reported stilt buried in Cuba, Haiti, Tortuga, Jamaica and Ste, Kitts. The isle of Trinidad presumably hides another pirate hoard. Inventions for August 55

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TRACK ‘Barrier LEADS AUTO Devices Upper lefts New rail- road track barriers built into roadway. 50 ft. from tracks rise to full height of 12 inches when train Conceve design of bar- tier and heavy springs supporting it can push back heavy trucks with- out injury to the car. A LIFE SAVER BARRIER which rises auto- matically out of the roadway to stop approach- ing autos as a train reaches the crossing is de- signed. to prevent future grade crossing acci- dents. The barrier rises 4 inches when the train is 20 seconds away, but cars can still get across. At the 10 second period it rises to its full height. Designed to replace horse and wagon on milk toutes, new delivery car has power plant which can be entirely re- placed in 15 minutes. The engine is built on rear axle. DETACHABLE POWER PLANT on the latest milk delivery truck can be “unhitched” and re- placed with a new gasoline “horse” in 15 min- utes. Although the small engine is mounted on the rear axle, the control system is simple. Starting off is just-as easy as picking up the reins and saying “giddap.” The entire delivery car costs about as much as a good horse and milk wagon, but is said to be more economical in operation. Since high speed is unnecessary a small engine is used. 56 Lights flash, bell rings, barrier rises before train passes. is 10 sec. away. Left:: AUTO SKYLIGHTS have been patented by Mrs. Manchester, a widow living in Bourne- mouth, England, to give passengers in sedans an improved view of the countryside. To improve view of countryside while touring, English widow has patented method for replacing curved portion of auto roof with special plate glass skylights, as shown. EVERY AUTO GADGET obtainable has been installed by Lyndon Grover to give him ‘the most completely equipped automobile dashboard in Hollywood. A few devices such as barometer, altitude meter, tachometer, and pressure gauges have been borrowed from airplanes. The opera- tion of every part of the car can be checked. Most completely equipped auto dashboard in Hollywood is this, being inspected by Joe Morrison, radio singer. In- cluded among gadgets. are 30,000 volt theft-proof switch, tear-gas bomb release, air speed meter, altitude meter. Modern Mechanix and

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Changeable Shoe Geels, Revolving Gray cAmong New Inventions For Housewives Shoe Heels can now be changed quickly. Replaceable heels sold with wom- en’s shoes are pried out with knife and re- placed when worn. Door Knob extension permits doors of closed stairways to be opened without stooping. Device is te- versed for top of stairs, holds beverages, food, and Lunch Tray napkins afl at once. Trays ate readily separated when handle is loosened. i s which clips to edge of cocking utensil can served with lemon Cooking Thermometer be read without removal from dish. Pointer Squeezer slice and tea removes on circular dial indicates exact temperature of food ‘at all times. Danger of all juice. No need to touch fruit with burning fingers in handling regular glass type thermometer is thus eliminated. fingers. Juice drains through holes. Inventions for August 57

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ARE YOU FIT to DRIVE by JOHN C. HARPER yer thousand people—one every fif- teen minuies—were killed by automo- biles in the United States last year. During the same period 850,000 others, were injured—an amazing average of one casualty every thirty seconds of the entire year. In the hands of the unsafe driver, the modern automobile has become a terrible engine of potential destruction. Speeds: of 80 and 90 miles an hour are virtually stand- ard in all present cars; yet a speed only slightly higher—100 miles an hour—was condemned last year by the rules committee of the Indianapolis Speedway as having “gone beyond the physical limitations of the track for safe driving.” Unsafe Drivers Menace Public Yet despite mounting casualty lists and high speed warnings men and women unfit to drive continue to roar down the high- ways headed for disaster. Some of these drivers cannot tell red from green; others see two cars where there is only one; still others become panicky and “freeze” when confronted with an emergency. To halt this senseless slaughter and stem the casualty flood, Dr. Alvah R. Lauer, asso- ciate professor of psychology at Iowa State College, has recently perfected a series of tests which determine, with remarkable ac- curacy, the limits of a motorist’s driving ability. : Dr. Lauer’s experiments cover every pos- sible contingency. His “driying dozen” go D0 Modern cars have become engines of destruction in hands of unsafe drivers. Here is the story of what science is doing to rate drivers’ abilities and make streets and highways safe. Left—Seated at the wheel of a dummy automobile, a subject is taking an ail- around driving test, as be faces the miniature stage shown below. Across the front of the stage, a toy car is suspended from an iron f- bar. The.-controls of the car in which the driver sits operate the toy car, moving it to left or right as the floor of the stage moves on an endless. belt, to simulate passing : read conditions. Driver’s task is to guide the toy car as if in actual traffic. tests the motorist’s field of vision, depth per- ception, ocular dominance, glare resistance, color blindness, length of vision, strength of grip, speed of movement, reaction to noise, motor control, nervousness and gen- cral manipulation. In forty minutes he can find out as much about the subject’s ability to operate an automobile safely. as might be revealed in several years’ actual driving. There is the matter of field of vision, for example. A driver with normal sight may look through the- windshield and yet, with- out changing the focus of his eyes, detect moving objects at either side. This gives him a total field of about 190 degrees, a margin of safety permitting him to watch crossroads and passing drivers. Other mo- torists; however; have an extremely narrow field, known as “tunnel vision.” They see only as much as the normal person might if he were looking through a length of pipe. Modern Mechanix and

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AN AUTOMOBILE Picture No. 1 shows an examiner at a galvanometer testing the driver shown in Picture No. 2 for nervous stability. Driver hae both hands on electrical contacts as an elec- tric current passes through his body. His reactions to the sudden sounding of an auto horn are recorded by examiner. Picture No. 3—Dr. Lauer, left, gives driver a field of vision test. Right, subject uses stereoscope to de- termine depth, or distance percep- tion. No. 4—The “glareometer”’ test. No. 5—Driver’s eyes are being tested for nearsightedness, farsightedness or blurred vis- ion. No. 6—Motorist taps telegraph key as rapidly as possible to determine speed of movement. No. 7— Examiner tests the driver for color blindness. A device for testing strength of grip is shown lying on the table. Dr. Lauer tests the field by placing a large cardboard protractor in a horizontal posi- tion in front of the driver’s eyes with the center of the flat edge at the bridge of the nose. While the driver’s gaze is focused straight ahead, a pencil is moved along the curved edge of the protractor from front to back until it passes out of the driver’s sight. The points of disappearance on ei- ther side give the measurement of the field. The reader can test his own field of vision in arough way by focusing his eyes on some object directly in front of him and wiggling his fingers at each side of his head. If he can see them when they are well to the side, he can be reasonably sure that his field is about normal. Dr. Lauer’s tests have shown (Continued on page 121) Inventions for August 59

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Radio Range Finder for Ships Gives Distance, Direction Emil J. Simon demonstrates | his radio range finder, which gives distance as well as direction to radio beacon, | Diver Broadcasts Under Water ADIO is seen as a new aid for under- water rescue work. First tests of a special radio receiver and transmitter unit have been made in the pool of the Park ’ Central Hotel in New York City. Chain radio broadcasts originating at the bottom of New York harbor, with a diver describing his walk among sunken ships, ocean bottom foliage, and the finny deni- zens of the deep, are being planned. Captain Charles B. Scully, who first tried out the device, is enthusiastic over its pos- sibilities for speedy rescue work. The diver, though unhampered by cables, is in constant communication with those above. A microphone and headphones are built into the waterproof rubber mask: Captain Charles B. Scully with a special Atoi radio transmitter built into diving helmet, just after making suc- cessful broadcast from bottom of Park Central Hotel pool, 60.. LL navigators will be interested in a new radio range finder which promises to eliminate- sea accidents such as_sent the lightship “Nantucket” with seven of her crew to the bottom after a collision with the liner “Olympic.” The new radio device developed by Emil J. Simon of New York, automatically and continuously records the distance and direction of a vessel from the radio station . or radio beacon to which it is tuned. Pres- ent direction finders do not record distance, and must be operated by hand. Giant Film Rolls Make Photo Mural Te takes big film to make world’s largest photo-mutal. Jolieta McCready compares one of rolls used in making of 600-ft. Ford mural with an ordinary small camera roll. PECIALLY made giant rolls of film were required for the world’s largest photo- mural, a composite photograph 600 feet. long and 20 feet high, presenting the story. of the modern automobile in a truly unique ; manner. This unusual mural, mounted on the. walls of the Ford Building at a Century of . Progress, is attracting the admiration of. thousands of visitors. Original 8x10 negatives, taken by George.. Ebling, personal photographer for Henry., Ford, were enlarged many times. The nega-:. tives in turn were printed upon huge sec-,. tions of photographic paper 40 inches wide;. and the strips pasted together. More .than a mile of printing paper,. 127 tons of steel and thousands of square feet.: of canvas and wallboard were required. Modern Mechanix and,

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Microscope Opens New Worlds to Hobbyists The microscope ia one of the ‘most important instruments used to safeguard the z alth of the public, It determines the standard of -quality of food and detects ison and deterioration in fruits, vegetables and meats, It is one of the ae powerful weapons used to fight disease. Above is the‘laboratery. . of a health department, where foods are studied under microscope. | by JULIAN D. CORRINGTON, Ph.D. HICH one of man’s millions: of dis- coveries and inventions is the most im- portant? Someone would. be certain to champion the automobile. Whereupon the sponsors of gasoline, steel alloys, electricity, rubber, gears and:a host of other entries would point to their choice as. being more fundamental. By carrying out this example, it would not be difficult to prove that every prominent invention and discovery is dc- pendent on other factors. Back of them all, however, is one instru- mént that is the important guardian of standards of perfection. It is the micro- scope! ` Ordinarily we think of microscopes as in- habifing: the remote: cloisters of higher learning or as basking lazily underneath bell jars in doctors’ offices; But industry, ever alert to seize upon new ideas or draft old'ones, has reached out. for the principle of‘ magnified vision.’ From the biological laboratory, where as students they mar- veled at the intricacy of cell structure ‘or watched the feeding activities of one-celled animals, graduates went forth and found that there was a practical need for thé microscope in everyday life and business. They also found unlimited entertainment. and instructive use for the microscope around the home and shop. How to com- bine pleasure with practical value with even the lowest priced instrument is the pur- Iaventions for August Photographs of microsco- pic specimens can be made by the ama- teur with the low-cost pho- tomicro- graphic out- fit shown here. A low power microscope was used to take this phote of a beetle: seizing a plant louse with its pincers. Many interesting insect battle scenes can be studied by amateurs with simple microscopes and photomicrographic outfits. pose of a series of articles that will appear here on the use of the microscope. Years of observation and experiment with the microscope put the science of metallog- raphy in the industrial spotlight. Now the microscope rules the field and dictates the proper metal or alloy for each new use, measures the grain size of metals, detects impurities and greatly improves. product, service and safety. Microscopes are used to detect counterfeit money. Police depart- ments solve major crimes with an instru- ment that was once frowned upon, except in fiction. Reading glasses and binocular mi- (Continued on page 133) 61

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Electricity Helps Paralyzed Patient to “Blow” Lights Out Above exhibit shows four methods by which paralyzed patient can help himself. At right is a pho- tograph of contactor drum, heart of unique electrical control used. “Asbestos” Man Walks in Furnace N A recent test of a new asbestos suit, a man walked into a large furnace and emerged unscathed by the raging flames. A special helmet kept out smoke and danger- ous fumes. The new suit will prove especially valu- able in fighting oil gusher fires, and in enter- ing burning buildings to bring out persons overcome by the smoke. Dressed in asbestos suit like that above, anyone can walk into burning house to rescue persons or tecover valuables. 62 ATIENTS who are unable to move hands or legs can still turn the pages of their books, turn on the radio, operate signal buttons, or turn the lights off. A unique electrical robot with four different methods of control, the secret of the above seem- ing miracle, was demonstrated re- cently before noted surgeons in a New York hospital. Almost human is the uncanny “thinking” mechanism of this de- vice. In one instance an ever-watch- ful electric eye picks up motions of the patient’s head, deducing from the length of the nod whether to turn the radio on or call the nurse. In other systems, the patient blows a tiny pipe, touches a metallic arm -with his cheek, or talks into a mouth- piece to operate the robot. The secret of the device is a con- tact drum which turns only when the light beam is interrupted. By prolonging the movement of his head the patient can turn the drum to a point which brings the desired unit into operation. An indicator flashes continually as the drum turns to tell its position. ‘ Milk to be Sold in Paper Bottles Ae just recently developed not only sterilizes, fills, and caps milk bottles, but actually makes the bottles. Everything is = : automatic, and the filled milk bottle can be turned out at a cost of less than one cent. A paper con- tainer used for the milk has many novel fea- tures. Sturdy construction per- mits it to be han- dled just as roughly as the glass bottles, without danger of leakage. A special clip which seals the bottle is easily replaced if con- tents are not used at once. Even if the milk freezes, the bottle re- mains sealed. New paper milk bottle is so cheap it can be thrown away after use. Top of bottle forms pouring lip. Modern Mechanix and

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HILE ‘America swelters in the grip of summer heat -waves, Little America, at the other end of th re globe, is braving the icy rigors of an antarctic b re communication be ae open in Aümniral Byrd’s Sout! Pole village. Nearly half a mile of these tunnels connect: buildings buried to the roof tops. ‘Fifty -six men live and work in this ice-bound community, snug and warm in their polar dugouts. The: community has a power and light plant, radio equipment, movies, repair shops, a library, complete medical. and scientific apparatus, a four-cow dairy anda ‘dog-town comprising: 122 huskies and 7 pups. In addition to the regular working crew, a. staff of scientists is studying the cosmic ray bombardment, the flight of meteors, thickness of the ice sheet and microscopic life in the Bay of Whales. Inventions for August MEDICAL STORES - BOUS STATIONS DOG TEAMS HAULED 650 TONS IS MILES. URED & FRESH MEAT. 1.]3 TONS” CORNEDS SALT. MEAT._12 TONS HICKENATUR EGGS 500 CASES BUTTERS LARD , COFFEE ATEA HYORATED FRUIT. VIATION GASOLINE.IGOOOGALS.

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ill “Black BLIZZARDS” - Dust storms carried away 300,000,000 tons of soil from fertile farms of the Middle West. Drifting sands that remain threaten to de- stroy this region. Here is a startling story about a storm that cost $2,000,000 a day. At left can be seen a huge drift of dust that almost covered farm machinery. Ia some cases the dust drifts were 20 ft. deep. by maor E. ga a S James Nevin Miller 6,400 PARTICLES INVISIBLE 3 . FER CUBIC INCH IGANTIC dust storms sweeping across the United States like “black blizzards” threaten to convert the fertile Middle West into a desert as arid as the Sahara. In a few days 300,000,000 tons of dust, once fertile soil in regions west of the Mississippi, were whipped into the air by strong gales. The vast cloud, so black and somber that the sun was hidden, had a front 900 miles wide. It originated in the sandy country of Montana, and picked up morc soil as it swept over the Dakotas, Minnesota and other midwestern states. The “black blizzard,” two miles high, continued on across the United States drop- ping its load gradually as it moved out over the Atlantic. The storm was a devastating climax to a 28 day drought. Wheat farmers in the fer- tile Great Plains areas lost an estimated Above are some unusual statistics gathered during the $2,000,000 a day as vegetation burned. dust storm by the weather bureau. The dust was so thick Countless cattle in parched fields sickened it drifted into homes through closed windows and in some : cases forced cancellation of schedules of transport airliners. and died as dust blanketed pastures, In- This exceptional view, taken by a weather bureau photographer, shows the dust storm sweeping down on a city in the Middle West. The cloud was 900 miles wide and moved 1,800 miles across the U. S. and on into the Atlantic ocean. 64 Modern Mechanix and

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MAKE U.S. The “Black Blizzard” engulfing a midwestern city is strik- ingly shown here. The. cloud completely shrouded the sun forcing automobile drivers to abandon their machines. numerable young plants, notably: wheat and corn, were literally blown from their base, causing severe crop: damage. The storm, Dr. W. J. Humphreys, of the Washington Weather Bureau, said, origi- nated in the bare land of the Great Plains states that had been pulverized by culti- vation and dried by severe drought. Violent gales swept this powdery soil up in a huge ‘cloud. -Experts point out that man’s attempts to cultivate dry lands in the far west threaten to convert the states west of the Mississippi into a vast desert. Formerly the loose soil and sand was held in place by wild grasses. Plowing under of this grass exposed the light earth to the constant winds. The erosion is becoming so severe it is feared “that within a few years the poor soil that remains will not support any type of vegetation. Investigation shows that the wind carries away the light, fertile soil, leaving the coarser sand to drift across the land.’ This sandy: soil will not hold water and unless steps are taken there is danger that the vast region will become a desert. Recent discoveries indicate that the Sa- hara was once a fertile country. Whether it was doomed to be an arid desert by dust storms is not definitely known, but records show that Europe has been swept for cen- turies by “black blizzards” originating in the Sahara. Inventions for August a DESERT? Above: A wea- ther bureau f: pilot ready to take off to get dust samples. Irving F. Hand, U. S. Weather Bureau aerial observer, is shown examining dust which he collected in his suction instrument. It showed 25,000 times more dust in the air. The dust particles were found to be twice the usual size. 65

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$50 “Prizes for “LIFE IN ICE” LETTERS The 14th day. Subjece encased in solid block of ice, Electrical instruments record heart action, according to photographer who took pictures. Photographer claims Canadian scientist hypnotized, then froze man in ice for 28 days. Above photo taken 12 hours after subject was placed in water-filled coffin and refrigerator turned on, shows ice crystals formed on face. Above: On 28th day ice was broken away from frozen subject with heavy hammer. Awakened from hypnotic trance; patient was said to be in perfect health, but raven- ously hungry, Left: Apparatus claimed to have been used: by scientist to freeze man for 28 days. Hypnotized patient ` was carefully lowered into water and instruments attached. AN a person be hypnotized, frozen in a- block of ice for a month, and come through the ordeal alive? Will the heart keep on beating when hundreds of pounds. of ice chill every muscle, every drop of blood in the body? You think it possible? In 250 words or less tell why, and you will be eligible for these prizes: ist $10, 2nd $5, and four third prizes of $2.50 each. You think it can’t be done—that the (Continued on page 133) 66 Modern Mechanix and

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Baby Goes A-hiking With Mother in New Kiddie Carrier A LENG English mothers who long for a jaunt over the breeze-swept moors and. uplands no longer need deny themselves the joys of hiking because toddling youngsters demand their presence at home. With a new device recently on view at the Camping Exhibition in the Imperial In- stitute, London, England, the modern moth- er simply straps the child to her back and sets off on a hiking holiday. Known as the “kiddie carrier,” the de- vice consists merely of a comfortable seat, supported by a steel frame, slung knap- sack-fashion over the shoulders. Broad straps permit free use of the arms and are adjustable so that the child’s weight may be distributed to afford maximum comfort for the hiker. A strap may be used io prevent over-frol- icsome babies from tumbling off backwards. Car Propels Ferry by Own Power Stopped directly above a series of rollers connected with the paddle wheels, this car furnishes its own motive power. OTORISTS along the Amersee river in Bavaria furnish their own motive power when they board a ferry to cross the stream. The car is driven onto a scow-like craft and stopped immediately above a series of rollers. These, in turn, are connected with twin paddle wheels at the sides of the ferry. When the engine of the car is started the traction of the rear wheels turns the rollers causing the paddles to churn the water. A slightly inclined ramp at the bow bridges the gap between ferry and landing stage. Message Girds Globe in 3 Minutes A NEW. Jong distance record for cable and wire communications was recently es- tablished when a test message was flashed from New York City around the world and back to its starting point in 226 seconds. Relayed by cable and wire for 25,000 miles, the message flashed across continents at a speed of about 6000 miles per minute. Inventions for August Photo shows ingenious device, patterned after knapsack, which permits mother to take child on hiking excursions. English Bike Is Built for Three ONG writers who once extolled the joys of a bicycle built for two must now re- vise their lyrics with the appearance in England of a tandem bike which boasts a side car for junior members of the family. The invention of an English cyclist, the side car attaches to the frame of an ordi- nary tandem bicycle and is sufficiently roomy to accommodate a small child in comfort. The spring-mounted sidecar is attached directly to the axle of the rear wheel. Photo shows a family bicycle tour in England. Note wind- shield on side car which protects the child from draughts. 67

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NTENNA PICKS UP oe : : a © : RADIO POWER AND y ~ CONTROL SIGNALS This design for a radio powered train was suggested by an electrical engineer. Radio impulses would supply pow- er and control train eliminating necessity of a pilot. Aerial Ferry Carries Automobiles PANNING. the Colorado River near Searchlight, Nev., is the only aerial ferry in the world for transporting automobiles. Forty miles down river from Boulder Dam, the ferry completes a short cut between Kingman, Ariz., and Boulder City. A 25 h.p. gasoline engine is mounted on the upper deck where the operator rides. The ferry earries three tons and makes the 640-foot trip across the river in 244 minutes. Eight éables above and two below support this aerial ‘aute- mobile ferry. A gas engine on upper deck operates it. 68 “Radio Cube Grain Gets GIANT RADIO s POWER TUBES Power from Air. RANSMISSION of power by radio will result in some radi- cal changes in industry, espe- cially in the field of transporta- tion. : Recent experiments with rail- road handcars run by radio sug- gested the design for a radio tube locomotive shown on the left. The electrical engineer who con- ceived the unusual power plant claims that such a locomotive could be controlled without a pilot. i The body of the locomotive would be surmounted by a series of huge radio rectifier and re- ceiving tubes. The gigantic tubes could be built of unbreakable glass. Vanes running the full length of the car above and be- low the tubes will radiate excess heat and prevent the red hot electrodes from melting. Electrical power impulses from a hydro-electric generat- ing plant would be picked up by the antenna, rectified, and trans- mitted to the motors. Radio im- pulses could also control the train. Outboard Bike Used in Water Polo This water steed develops 18 to 25 miles an hour and is controlled by one hand. It was designed for water polo. A mount has been designed for the exciting sport of water polo. The boat is controlled by the player’s left hand so that the right is free to swing the mallet. : j The rider sits comfortably in a motor- cycle saddle and controls the speed and direction with a special motorcycle hand grip on the steering bar. The boat has a speed of 18 to 25 miles an hour. The huil is’ a watertight pontoon, with a rubber bumper all around it. The boat is propelled by an outboard motor. Modern Mechanix and

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German House Built of Steel Hoops Is Earthquake-proof Photo at left shows the early stages of the construction of a novel house in Dusseldorf, Germany, whose frame-. _ work is composed entirely of a series of huge steel hoops. Right, ALLS, pillars, wooden props, iron and concrete are eliminated in a new “steel hoop” house recently erected in Germany. Builders contend that this method of con- struction places less weight upon the foun- dation, reduces vibration and hence lessens the dangers of earthquakes. The only supports are a series of huge steel hoops which bear the entire weight of the structure. Numerous other advantages are claimed for the new structure. Its simplicity per- mits building in a few days. The absence of interior walls conserves space and the houses are said to be easily transported from one place to another. The hoop framework is so completely covered by the walls and roof that the en- tire unit is very little different in appear- ance from an ordinary home. Wheel Springs Absorb Auto Bumps use with a non- ` pneumatic balloon tire, a new shock- absorbing wheel is said to combine easier riding with lifelong qualities. The wheel con- sists of powerful springs set under heavy pressure, arranged so that all shocks are ab- sorbed within the wheel itself. In op- eration, all springs bear equal parts of the load. Inventions for August under road jars in this new auto wheel. Powerful springs set heavy pressure a sorb ESIGNED for the completed house, showing simplicity of style. Camera-Gun “Shoots” Pictures — NEW camera-gun tħat takes still or mo- tion pictures simultaneously with the firing -of the pistol or rifle to which it is attached is the latest weapon available in the war against crime. Invented by Francis X. Bushman, former film star, the device will take a photograph of the fleeing criminal or record the license number of the getaway car even if police gun fire misses. The camera operates at an opening of F. 3.5, enabling detectives to take high speed pictures, Francis X. Bushman, for- mer movie star, is shown at right with his remark- able invention, the cam- era-gun, which takes still or motion pictures as gun is fired. Even though bul- lets miss fleeing bandits or escaping motor car, camera makes positive record which may aid in capturing criminals later. elow: Closeup of the camera-gun mechanism. 69

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Ships are LAUNCHED with Sand, says Nic Sprank in ODDITIES of SCIENCE MAN KNOWS MORE ABOUT THE mm MOON THAN THE EARTH. -Muchof the earth has never been seenly \ hunt yes Bul the entire moons Surface leas been minieyerored by astronomer S-AU Wallace Keras tea Wes E g BEE IS WORTH MORE THAN ITS WEIGHT IN GOLD, Agueen bee TS worth about 34 times 775, ! meh it gold- N LA LASTAGCT St.Chatles Mo, JEEHE SLOWEST THING IN THE WORLD IS A CLOCK WHEEL. tM ACOTIR SEI TL l the grea dockor” therormerluperial Palace in borsdzm, Germstty, revalves et ONCE 1? SOQ VOUS: ME) ~Z SCANERE Mianexpilis, Minn. | FISH ISA MODELFOR AIRPLANES. S HIPS ARE LAUNCHED WITH SAND. i Many modern airplanes and motor MO JACK ÍS SIONS CHOUZA TO SUDDOrÍ A N cars ate How Leing designed after ocean diner, dren boxes tilled with sand the dolphin, most perrecty Stream are used in launching. Removal Of Dug | ; ined spa P y G PRIMUS Sala 10 escape, gelitly [OWeITRg ; Wed ocean fish .— g D fo Wavs--Frank B.Murphy BUT, | Paul Ward, Jackson Mich Win $1! Send your Oddity of Science to Nic Sprank, Modern Mechanix and Inventions, 529 S. 7th St., Minneapolis, 70 Modern Mechanix and

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German Life Saving Suits Handled by Huge Cranes LEE sea divers, German firemen are now equipped to protect their own lives when rescuing victims of gas in under- ground mains. A cable lifting and lowering apparatus permits the fireman full freedom of move ment while searching for gas victims in underground mains. If the fireman himself is overcome, he can be raised, as is done with a sea diver, from the conduit in an upright position, a necessity due to the nar- row openings in mains. The ladder truck serves as a derrick, a pulley being attached to a ladder held over a conduit. The fireman is further fitted with a gas mask and electric lamp. Tall Men No Longer Cut Off View IEW of football and baseball games or shows shut off by the tall man or woman wearing a hat in front should not bother spectators any longer with the device pic- tured at the left. The instrument works on the prin- ciple of the peri- scope with a mir- ror in each end. Thespectator whose view is ob- scured places the lower mirror at or near the level of the eye. Upper mirror stretches over his head to whatever height he wishes in order to get an unob- structed view of the game or show. The image is re- flected from the upper mirror to the lower. Views of games obstructed by tall men can be improved with the little device shown above. Jupiter May Predict Our Weather REDICTING weather on this world by watching bands and spots on the planet Jupiter may develop from a series of obser- vations conducted by Professor Lucien Rudaux, of the Donville observatory in France. For years Professor Rudaux has watched light and dark bands and spots, believed to be cloud layers controlled by the sun and Jupiter’s moons. The same solar influence affects the earth’s weather. Inventions for August German firemen are equipped like sea divers when searching for victims of gas in under- ground conduits. The appara- tus to lower and lift the fireman does not hamper the rescuer at work underground, yet is al- mays teady to pull him out should he himself be, over- come by gas. At the right is the cable contrivance that keeps him upright while being lifted through street opening of main. Robots Guide Transport Planes N AUTOMATIC pilot, called an “airo- bot,” now guides trans-continental pas- senger airplanes from one city to another without the aid of the human pilot. The “airobot” is now in use on 3-mile-a- minute transport planes operating between New York, Chicago and the Pacific coast. It was designed to relieve human pilots of the effort of flying a plane. A robot that eliminates the work of the human pilot on transport planes is shown above. The metal box, about a foot square, guides 3-mile-a-minute passenger airplanes. 71

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How (2ARNIVAL “Racketeers Eager crowds, like that above, throng the carnivals and side- shows, squandering dimes and quarters on devices whose odds are fixed in favor of the operator. Right, a percentage wheel, in which the winning numbers are predetermined by a series of gears in the hub. Carnival confederates, knowing the various sequences, cover these numbers and walk off with the prizes. by EARL CHAPIN yess of dollars are taken from the public by clever operators of the smaller sideshows and carnivals who have capitalized upon the American love for games of chance. Cries of “Try your luck” still meet with ready response despite the fact that one might as well back a three-legged horse to win the Derby as to buck the carnival games and gyp wheels. But the gullible bystander persists. He believes that Juck and the law of averages has something to do with it—and he’s right; but the luck is all with the operator. The player doesn’t stand a chance. He can’t win because the games are set against him. The Mechanism of the Ball and Tenpin Game A good example of the mechanical ingenuity be- hind some of the devices used to fleece a customer is afforded by the familiar “Ball and Tenpin” game. A ball, suspended by a chain from a gibbet-like cross-arm, swings in an arc on a level that permits it to bowl over a tenpin set in a notch on the plat- form below. The player must release the ball in such a manner that it passes the pin going out, but bowls it over on the back swing. When the operator demonstrates the trick it looks amazingly simple; but, try as he will, the player cannot duplicate the performance. The secret lies in the fact that the tenpin isn’t where it was when the operator was demonstrating a moment before.. Not even the man who invented the trick could beat his own game now. By a simple mechanical adjustment the notch in which the tenpin rests may move, the entire board may move or the arc of the swinging ball may be changed. Another carnival racket which has proven a 72 Clever sharpers rob the public of vast sums in catni- val games. This story reveals their secrets. GEARS IN HUB OF WHEEL Ta: BOARD 4 WITH | GUIDE BLOCK SLIDES ~~. IMPOSSIBLE TO KOC hem PIN OVER WHEN EITHER GUIDE BLOCK OR CROSS : ARMIS SHIFTED ONE WEIGHTED BRICK IN 80T- TOM TIER MOVABLE BACK PIECE CONTROL~ LED BY LEVER Above, three games which the player cannot teat. Diagram shows how tenpin game works. Weighted brick in pyramid cannot be knocked frem counter. A lever locks the eat in place. Modern Mechanix and

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GFLEECE the “PUBLIC From the G-Wheel swindles to the bucket concessions, the odds are stacked against the bystand- et or “customer.” | CONFEDERATES CONTROLTENT. ; BALL BEARINGS —~ z ` TRANSMIT THRUST ~ TO TIGHTEN SANJO | HEAD FALSE BOTTOM SHIFTS TO MAKE CANVAS MILK ; HALF FULL OF : MERCURY: g Above, control rods tighten the bucket bottom, making the balls bounce out. Right, mercury in milk bottle is shifted at will. When at bot- tom, the player cannot knock the bottle over. Inventions for August K: BUCKET SHALLOW OR DEEP L One of the biggest money-makers on the lot is the G-Whee! m (“Gyp Wheel”). Players rely on its honesty because all working parts are apparently open to inspection. The solid framework is bolted to the counter with screws. A metal arrow centers on a spindle which rests on a piece of glass laid on the counter, But the board on which the glass rests is movable. The board drops, the spindle runs free and the arrow may be stopped at any point by a clever operator without detection from crowd. veritable mint to its operators is the familiar “bucket shop.” In this game the player’s problem is to toss three bails into a shallow, tilted bucket, in such a manner that the balls will not bounce out over the rim again, but instead roll out of the round hole on the downward side. While the operator drops the balls into the bucket with consummate ease, the player invariably tosses one ball a little too hard and it bounces out again. If the player scents trickery and protests, the opera- . tor may even take his bucket out onto the fairway and prove to his customer that he can still make his balls stay put. Convinced, the customer tries again, but with no more success than before. Of course he can’t win! The bucket has a false bottom which either permits or precludes the pos- sibility of making a successful toss by the simple turn of a confederate’s wrist. - Why the Balls Bounce From the Bucket The bucket may have either a “banjo head” bot- tom, or one which moves up or down, causing the receptacle either to be deep or shallow. The “banjo head” bottom is made of pliable material which is made taut or lax by the pressure of a circular piece of steel which acts in the same manner as the tone ring in expensive banjos. When the bottom is at its maximum springiness, the ball will bounce out no matter how easily it may be tossed. The operator communicates with his confederate by means of word signals included in his conver- sation with onlookers. The accomplice may be be- hind a curtain within the stand, or in a control room near by. Usually it is the latter case, for this arrangement avoids detection. (Continued on page 124)

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Skeleton Robot Shows Perfect Golf Swing in Slow Motion Photo shows the electrically operated golf robot whose limbs assume proper position for each stage of the stroke. Motor Drives New Hedge Clipper (Goer a long and tiresome task, Ftrimming the hedge or other lawn shrubbery becomes a comparatively simple job with a new powerdriven cutting tool. An endless belt of cutting teeth works against a set of stationary teeth, much on the principle of a mowing machine. The shears weigh only six pounds and are driven by an electric motor. Top photo shows simplicity of operation of the hedge ehears, 74 Below, a closeup, showing the machine in detail. Peeeeer golf, the dream of every duffer, is now possible through study of a robot that executes a faultless golf swing in slow motion. The robot is skeletonized, enabling the novice to study the body movements ordi- narily hidden by clothing. As the down- swing is started, the head, shoulders, arms, hips, legs and feet of the robot move into co-ordinated position. Every detail of the complete stroke is shown in the mechan- ized figure. Electrically operated, the golf robot is about 18 inches high. It projects through a glass plane to which seven miniature clubs are fastened in the proper positions for the various parts of the swing. Latest Escalators Streamlined A view of the modernized escalator, showing streamline influence. Note built-in show cases near landing stage. OMBINING beauty with utility, engineers are applying streamline principles to department store escalators, or moving stairways. The sides of the canopy enclosing the mechanism for the escalator to the floor above are to be utilized for moving mes- sages. Another feature of the new models is a set of show cases built into the escala- tor sides. Lemon Slicer Cuts Ten Sections N INGENIOUS arrangement of ten knives neat- ly cuts the fruit into uniform sec- tions in a new Jemon slicer now on the market. The knives are: both rust and acid proof and simple construction makes them easy to clean. The juice is caught in a cup- like receptacle at the bottom of the device. Uniform sections are speedily cut with this new lemon slicer. Modern Mechanix and

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ECENT correspondence in connection with this department has convinced the editor that many readers fail to send drawings of their inventions in for criticism merely because they feel that they are not capable of making them. A much more valuable opinion can be given if a simple sketch is sent along. The crudest kind of a sketch will do so long as it at least outlines the working principle. Summer is here and people are again using win- dow screens. Adjustable screens have the habit of rattling during the night. Some sort of a little pressed metal spring that can be slipped onto the edge of the screen is needed to prevent movement in a wind. This should be made cheaply enough to sell in the five and ten cent stores for five cents apiece. Motorcycles are dangerous to drive on wet pave- ments; there is needed some sort of an anti-skid device to be attached to the rear wheels. This should prevent the machine from slipping out from under the rider. Naturally, no chain can be used. The device should attach to the frame of the machine so it can be placed in use during wet weather. It would be worth at least $100,000 to the motorcycle industry. A twenty-five cent attachment for cameras that ‘would prevent the operation of the shutter until a fresh film is rolled into place would be a boon to amateur photographers and a still greater boon for the inventor. Who can invent a license plate frame for auto- mobiles that will require no bolts and no tools? It should clamp the plate into position in such a positive fashion that it cannot be jarred loose. Gardeners need a special sod cutting shovel that will more or Jess automatically cut a square foot of sod three inches thick. This would take a great deal of the backache out of such work, and at the same time speed the operation un 100%. Large dressmaking establishments and garment factories cut cloth with motor-driven rotary knives. (Continued on page 142) Inventions for August DISPENSER | — : _ m Above are a few ideas for little inven: ` © tions that may spell wealth to, the men who can solve the problems described in the text. If you want to know how to secure a patent or how to protect your idea, send a letter to the Patent Editor, 529 South Seventh Street, Minneapo- lis, Minn. Be sure to include stamped self-addressed envelope. Send sketches if possible. Models can not be accepted. TƏ

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Composer’s Dream Leads to the Invention of a New Piano This double keyboard piano was designed after the [ate Emanuel Moor had a dream in which he saw Johann Sebas- tian Bach standing at a piano with two keyboards. The photo shows Mrs. Moor demonstrating the instrument. Electric Ear Finds Car Knocks N ELECTRICAL ear quickly diagnoses motor noises and locates trouble in auto- mobile engines. A number of electric wire cords from the instrument are attached to the spark plugs and other parts of the motor. Acting like doctors’ stethoscopes, these cords amplify motor noises and convey electrical impul- ses to a number of dials which indicate where the trouble is. The analyzer was invented by Conrad Mueller, mechanic, and Lou Pearl, former racing car driver, after seven years of ex- periments. The instrument eliminates the necessity of mechanics straining their ears in an effort to locate noises and knocks. DOUBLE keyboard piano has been de- signed as the result of an uncannily real dream of a Hungarian composer. In 1921 the composer, Emanuel Moor, had a dream in which he saw the famous com- poser, Johann Sebastian Bach, standing at a piano with a double keyboard. Moor im- mediately started to tear down his piano and rebuild the “dream instrument.” When he died, his wife continued the work until the piano was finished. The instrument, now on exhibition, is said to hold its own against a full orchestra. Comic Trolley Houses Birds N unusual bird house, a repli- ca of Fontaine Fox’s rickety “Toonerville Trol- ley,” has 45 feath- ery tenants. Even the well- known “skipper” of the popular car- toon graces the replica on lawn of Fritz Meyn, sports- man, of Lawrence, Kans. The bird house, built of scrap wood and metal, is five feet long and four feet high and weighs 150 pounds. It stands on asection of track on top of a 50-ft. pole. The cartoon bird house is complete. This ‘Toonervilfe “Trolley” bird house has 45 tenants. The dials of this new electric motor trouble analyzer show that the automobile being tested here has two faulty valves. 76 Modern Mechanix and

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Speed Boat Relay Racing Is Latest Sport for Outboards PEED boat relay racing is a new and spectacular water sport. Fast action, spills and thrills are witnessed as the par- ticipants pass the baton going at full speed. In races held at Long Beach, Calif., re- cently four teams of two boats each en- tered. The race was run over a distance of five miles. Four boats, the pilot of each carrying a baton, start the race in the usual manner. At the end of the second lap the four relay boats start out on the course. The baton is passed during the third lap. When the re- lay boat gets the baton, the pilot continues the races as his teammate drops out. Roller Skate Skis Used Indoors Skis with wheels are used im indoor exhibitions. Metal glasses with slits prevent snow blindness while outdoors. KIS equipped. with wheels are being used for indoor exhibitions in Sweden. . The -wheels,. resembling those: on roller skates, are placed in pairs in the. center of each ski. The roller equipped skis permit indoor exhibitions on wooden.ski slides. . Metal protectors for the eyes are also being used in Sweden by outdoor. skiers. These ski glasses are designed to’ keep. fly-";- ing and blinding snow. out of. the-‘eyes. They are made of metal with small fissures to cut down light reflected from snow. Inventions for August The thrilling moment when baton is passed in outboard relay races is shown above. Four-foot wooden baton carries team’s color pennant, Designs Streamline Train Shell TREAMLINE shells to cut down the wind resistance of ordinary railroad locomo- tives and tenders have been designed by Norman F. Zapf, senior student at Case University. A single, lông shell, made of aluminum. alloy metal, fits snugly over both engine and tender to convert the train power plant into modern streamline equipment. The shell .eliminates the necessity of building new streamline locomotives to meet the competition of new high speed trains. Wind tunnel tests show that Zapf’s shell cuts down the wind resistance one-twelfth, . which would mean economy in fuel and _greater speed to the railroads. Zapf’s shell has been tried out on a model train. When built for actual size equipment, it will have a flexible joint between the locomotive and tender. This will permit taking the curves “swithout increasing the wind resistance. : Norman F. Zapf invented this shell to convert ordinary loco- motives into streamline models for faster railroad service. TT

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Engineers Repair SUNKEN HIGHWAYS Highway engineers have solved the problem of repairing dips in heavily traveled roads by use of a machine which floats sun- ken pavement into place with- out disrupting traffic. Here is the story of the magic mud which makes our roads safe. by FORCING MUD Under “Pavements Photo above shows a highway crew in action preparing the mixture which is to be forced under the sunken pave- ment. The drawings at the left illustrate steps in the process. Lower panel is closeup of work done in photo. [JANGEROUS dips in the highway which menace high speed traffic are now elim- inated by a machine which literally “pumps up” the sunken pavement to its normal level without disturbing traffic. Hitherto the filling of depressions left by settlement of the pavement’s subsurface through water movement or frost erosion meant detouring traffic while the concrete surface was reconstructed. The new meth- od introduces a mortar under pressure be- neath the concrete which floats the paving into place with a minimum of delay. Air compressors mounted on trucks fur- nish the power for the pneumatic drills which are used to make holes in the slab to be raised. Dry black top soil and cement in the ratio of 20 to 1 are then reduced to the consistency of thick cream in a portable mixer and introduced under the slab at a pressure of about 100 pounds to the square inch. As the cement takes up water, the mixture swells forcing the slab upward. The size of the dip is of no particular con- sequence, since tests have proved that de- pressions from one to eighteen inches can be raised with equal ease. Flat curves, built in the days of comparatively slow traffic, can likewise be elevated efficiently. Modern Mechanix and

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Mechanical “Willie” Combines Crooning With Housework ROONING in a mellow baritone on com- mand and manipulating a vacuum clean- er with almost human skill, “Mechanical Willie,” laboratory robot, may prove a novel servant. The product of Westinghouse engineers, Willie salutes, raises flags, smokes, sits, stands and bows.at fhe operator’s orders. Words spoken via a receiver are trans- formed by a photo electric cell into light beams which transmit impulses to his oper- ating mechanism. Novel Device Electrocutes Flies Lured by a can of molasses in center of screen, flies light on wires.and are electrocuted by ahyale power charge, PECEARIN G war against the. winged pests inevitably drawn to their plant, a Cali- fornia dairy company has recently installed an electric fly killer. The device consists of an octagonal framework of wires laid over a funnel- shaped structure. A can of molasses in the center attracts the pests. They alight on the wires which carry a charge of sixty volts and are electrocuted on contact. New Tool Weeds and Edges Garden ESIGNED to re- duce labor, a new garden acces- sory combines weeding and edg- ing properties in a single disk tool. Used vertically, the device leaves a clean edge along walks and flower beds. Held paral- lel to the ground it destroys weeds as it cultivates ` the soil. . All adjustments may be made with- out use of tools. Above, edging turf along walk. Below, tool adjusted for weeds. Inventions: for August After demonstrating his mechanical and domestic abili- ties, Willie takes time off to indulge in a little sentiment. . Pencil Sharpener Is Automatic NTIRELY automatic in operation, a new pencil sharpener is started or stopped by the insertion or removal of the pencil. Crowding or pushing will stop the finely powered motor before the point of the pencil can be broken. Various kinds of.points are obtainable, ranging from needle to stubby point in both common and colored pencils. This new pencil sharpener is easily operated with one hand. Insertion of the pen cil starts and stops the ma- chine which furnishes a large number of different points, Colored pencils are as easily sharpened as the ordinary variety and the machine is said to leave no ‘graphite dust to soil hands.

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In field of trans- portation, air liners, Burling- ton “Zephyr” train, modern motor cars, and new Union Pa- cific train set new records for Diesel power. Italy’s . Augustus, largest motorship in the world, has trav- eled for years un- der Diesel power. i This Sterling crankless Diesel is designed chiefly for small marine craft. Direct-drive engine has low weight, high speed, and large power of gasoline engine. Cylinders are horizontal, permitting much lower engine construction. Low center of gravity makes engine ideal for war tanks, for ` powering gun carriagés, and for autos. As in most Diesels compressed air in small pressure tank is used for starting. 80 Speeding over high- ways and above them, over oceans and under them, 1934 Diesel en- gine heralds dawn of a new eta in transporta- tion, in power genera- tion, and in industry. by ROBERT FAHERTY HE Diesel era is arriving! Under high compression and with swift, sure strokes the Diesel engine is pounding its way into all corners of the world, bringing new speed and power to industry and to transporta- tion. The lowly “rational heat motor” patented by Dr. Rudolf Diesel in 1892, and consid- ered an outlaw among engines for almost a score of years afterward, has today he- come a multitude of different Diesel types, all revolutionizing their respective fields in industry. “The Diesel has got to come,” says Henry Ford, as he experiments in his Fort Myers, Florida, workshop with some new idea for a Diesel engine. “I do not know or care in just what shape, but it is our business to find out.” Early Diesel engines were crude and bulky, suited only for stationary: installa- tions in power plants or perhaps on large ships. Modern engineering research has developed this first oil engine with swift progress to the point where, today, the Diesel engine is breaking new speed and power records on every hand. The Diesel is an internal combustion en- gine without spark plugs. Air is compressed Modern Mechanix and

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Conventional Diesel engine pictured at right is harnessed in many ways to supply power needs of industry. Power shovels, huge motor trucks, freight locomotives, and cross- country busses all herald the dawn of the Diesel era. New starter equipment permits Diesels to be used anywhere. in the cylinders to pressures of from 375 to 600 pounds per square inch. So great is this compression that the air inside is heated to over 500 degrees Fahrenheit. ` Fuel oil sprayed into this heated air immediately explodes. The easy ignition makes possible the use of crude oil or other cheap oil refining residues. Larger Diesels can operate on cruder oil than can the light, high-speed Diesels used for transportation purposes. The cost of fuel therefore varies, but it is always less than that of kerosene or gasoline. Railroads Use Diesels The Diesel engine is now coming into its own in the field of transportation. Rail- roads are putting out high speed, Diesel- powered trains with latest of modern con- veniences in a determined attempt to regain traffic lost to the busses and to automobiles. The Burlington “Zephyr,” an ultra- modern and stream-lined three-car train, depends on an 8-cylinder, 600-h.p. oil-burn- ing Diesel for its absolutely safe cruising speed of over 100 miles an hour. The second of Union Pacific’s “Trains of Tomorrow,” now being completed, will use a 12-cylinder V-type Diesel. The first of these trains, though powered with a 600 h.p. distillate-burning engine, has already set new records for speed and economy of operation in its exhibition tours of the country. With Diese] power the train can carry enough fuel for a 1,200-mile run, An ordinary steam locomotive must re-coal every 100 miles. A small Diesel in the new streamlined railcar of the Great Western Railway in England gives almost entirely automatic (Continued on page 120) Inventions for August FUEL INJECTION / Top diagram shows relative positions of opposed pistons and tilted discs of new Sterling crankless Diesel. As many as six cylinders may. be grouped around disc. Special bearings convert back and forth motion of pistons into rotary motion of drive shafts at each end of engine. Below: Arrangement of intake and exhaust manifolds is simple. 81

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Electric eMuffler Warms Open Car “Driver Discomforts of open car motoring are eliminated with this electric muffler, which wearer is shown attaching to dash. Gadgets Create New Form of Art IN funnels, microphones and similar me- chanical gadgets were used to create a new form of “synthetic” art in a one-man show recently held in New York City. Choosing such well known men as Floyd Gibbons and the Prince of Wales for his subjects, the artist achieved some unusual results in his strange medium. Gibbons’ news-seeking ears were pictured as funnels, his mouth as a microphone and his head a jumble of miniature telegraph wires, guns, war ruins, and Mexican souvenirs—all sym- bolizing Gibbons’ famous career. The Prince of Wales, generally known as a “good egg,” was pictured with an egg- shaped face, decorated with pieces of har- ness, haberdashery and other symbolical devices. picture of Floyd Gibbons, noted Insert, Ted Weidhaas, artist-inventor. Photo shows a “synthetic” radio and news star. 82 . fee problem han- OTORISTS who enjoy driving an open car, yet are subject to throat colds from exposure, are assured comfort with a new electric muffler recently invented by a Los Angeles man. In appearance the muffler resembles the conventional models; but woven into its fabric is a cleverly devised heating unit which effectively dispels the chill breezes. Electric current for the device is supplied by the battery of the car. An extension cord attached to one end of the muffler plugs into a convenient socket on the dashboard. Little current is consumed and comfort is assured on the coldest days. Horse’s Bit Is Radio Antenna A Chicago radio executive tunes in his favorite program as he sets off for a canter. Batteries are in saddlebags. NWILLING to miss some of his favorite programs while on the bridle path, a Chicago radio executive devised a horse- back radio set which uses the animal’s bit as an antenna. The set, which has proven unusually satisfactory, is mounted directly behind the rider. Electric power is fur- nished by batteries carried in twin saddle- bags. Paper Picnic ae Have Handles MART paper cups equipped with handles are among the new- est picnic acces- sories. They solve the hot cof- dily and may be discarded after using. Handles on paper cups now per- mit safe handling of hot liquids. Modern Mechanix and

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New Automatic Device Answers Phone, Records Message pate H. ROWE, a Los Angeles sound en- gineer, has perfected a nearly human robot that answers his telephone perfectly when he is out. The ringing of the telephone bell starts this ingenious machine operating, and whatever the caller says is received by a microphone and recorded. When Rowe re- turns, he is able to listen to whatever mes- sages have come in. Expert Tastes Soap for a Living TESTING soap by taste is one of the chief duties of Joseph Strobl, chief soap maker for a Los Angeles company. He sam- ples the cooking product much like an expert chef. Chemical tests take too long at critical stages and are said to be less accurate than Strobl’s tongue. Photo shows expert testing soap by tasting sample from caldron. Auto-ship Runs on Land or Water PRACTICAL amphibian run-about has been designed and built from odds and ends by a California man, who has made several successful trial runs with it on high- ways and waterways near Sacramento. In the water it is driven by a motorboat wits. Paul H. Rowe demonstrating his ingenious telephone robot which takes and records messages phoned in his absence. He predicts these machines will soon be in wide use. propeller, and on emerging the power is transferred to the rear wheels. Power is supplied by a two-cylinder, eleven horse power motorcycle engine, equipped with a fan for cooling at the high r.p.m. attained when the propeller is used. The vehicle is steered like a common automobile. This unique amphibian, made by William Faulkner of Sacramento, Cal., from odds and ends of automobile and motorcycle parts, can travel twelve miles an hour on water, and reaches a speed of about fifty miles an hour on land. Inventions for August 83

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This New Room Cooler Looks and Acts Like a Chandelier This new room cooler also serves the purpose of a chandelier, as it is equipped with light bulb sockets. It is attached to the ceiling as shown in the upper picture, which illustrates the distribution of air currents created by its small, economical mo- tor. The lower picture is a close-up of the cooler, showing its neat and mad- ern design, which fits in ony decorative scheme. Compressed Gas New Motor Fuel ASOLINE as a motor fuel will be sup- planted by compressed gas if the in- vention of Dr. C. Walter, an Englishman, becomes popular. Dr. Walter, after years of experiment, recently succeeded in per- fecting a method for using gas stored in small tanks under high pressure to run his 20-h.p. Rolls Royce. On the trial trip, he proved that his invention had a double advantage when he hooked up one of his gas supply tanks to an ordinary ring burn- er and prepared tea by the roadside. A special carburetor mixes gas with air. Dr. Walter shows how easy it is to prepare tea by the roadside if your car is one that runs on compressed gas. 84 ROOM cooler and dehumidifier which looks like an ordinary compact chan- delier—and also serves that purpose too —is the latest aid to comfortable living, and introduces an entirely new principle in room cooling. The chilled air is forced out in a horizontal direction and allowed to drop of its own weight, instead of being blown out at high speed from a point at or near the floor, as is the case with most cooling outfits. Guards Reduce Motorcycle Injuries These new wing guards attached to the front frame of a motorcycle were developed for the Minnesota state police in an effort to reduce the number of motorcycle injuries. Bo legs and other injuries which result when a speeding motorcycle skids and overturns can be largely prevented by the use of new guards perfected for the use of the Minnesota state police. Made of strong, hollow steel tubing, they are at- tached to the front frame of the motor- cycle on either side, as shown in the pic- tures above. When the motorcycle falls over sideways, these guards protect the driver’s legs and bear the brunt of the shock. They also serve the purpose of stopping the machine when it begins to slide along the ground, thus eliminating some of the danger of severe abrasions suf- fered by drivers who are dragged some- times a distance of a hundred feet or more. The guard “wings” may be folded back flat against the frame when they are not wanted, and can be instantly opened out -again when on a hazardous chase. Modern Mechanix and

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Fight Fire 40 Years to Work Burning Mine Braving the dangers of cave-ins, explosions and supet-heated temperatures, hardy men have worked a burning copper mine in Arizona for forty years. Above—-A view of the open pit of the burn. ing mine at Clarksdale, Arizona, showing fumes issuing from ground. ‘Right — Artist’s draw- ing showing in simpli- fied form how the un- derground crews are protected from the menace of the flames by concrete bulkheads walling off the fire. AGING with varying degrees of intensity, a fire has burned in an Arizona copper mine for forty years; yet it has remained in continuous operation despite the menace of the unconquerable flames. Located in Clarksdale, Ariz., the affected area involves more than 5,000,000 tons of copper ore. During the four decades since the fire started in 1894, many lives have been lost, directly or indirectly, as a result of the flames which have heated the rock to 1200 degrees. The fire originally started on the 300-foot level at a time when large quantities of timber were used for shoring purposes. A large body of ore caved in, producing suffi- cient friction to ignite the timber props and later to fire the sulphur in the copper ore. Since that time the mine has burned, burst- ing into raging flames in some sections and smoldering under a slow state of oxidation in others. Faced with the menace of a fire that could not be controlled, less hardy men might have abandoned the mine and suspended Inventions for August eure BREA © operations; but the Arizona workers would not admit defeat. An elaborate system of ventilation was promptly evolved. Fresh air was forced under pressure into the area, driving the combustion gases back into the broken and caved ground. With the working rooms free of gas, operations were resumed. High temperatures prevailed and miners were forced to wrap dynamite in asbestos to fore- stall accidents. Eventually this method proved too ex- pensive and the burning area was sealed off with concrete bulkheads down to 1000 feet. Operations since then have been con- ducted largely above the affected area. Yet mining also continues underground. Watchmen patrol all timbered areas con- stantly. Fresh air is supplied by a machine which. pumps a quarter-million of cubic feet every minute of the working day. The temperature of the air in the working rooms is tested frequently and water is applied whenever there is the slightest suspicion of heating. 85

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by Robert Page Lincoln on the bait casting rod as the favorite of sportsmen everywhere. For the fly rod there are a host of imitation bugs, flies and other types of life, found near the waters, from which to make a selection. To properly use the different kinds of bass bugs one should cast to a likely spot. Permit the floating bug to remain motion- Abeer. lures have become so popu- lar that they have practically replaced live bait with sportsmen. These plugs, bugs, flies and spoons have increased in num- bers so greatly that there literally are thou- sands on the market. Indeed each of these lures has some merit and in most cases proves more killing than many a live bait. The fisherman now has hundreds of patterns from which to choose and without a doubt can find a lure to resemble any of the live types. Lures Should Imitate Live Bait Sportsmen who claim that this or that lure is useless in tempting game fish often are mistaken. Usually the difficulty lies not with the lure, but with the fisherman’s man- ner of handling it. It must be remembered that.a lure usual- ly is intended to imitate some form of life sought as food by fish. To properly use such a lure, therefore, the fisherman must, as nearly as possible, imitate the actions of the artificial bug, fly, minnow, or animal - he is using so as to completely fool the wary denizens of the streams and lakes. Artificial bait is either of the underwater or floating type. So popular has the latter become that the fly rod is rapidly gaining A few of the popular lifelike lures are shown: above. There are a great variety of others that are equally effective for hooking game fish. All types of life eaten as. food by fish are being imitated. -The sizes vary for different fish. 86 Modern Mechanix and

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Hundreds of lures are available to the fisherman. The problem is to use and select them effectively. An ace of anglers here tells you just how to get good results with artificial bait. less for a few moments on the water. This will give the bass, who may have noted the drop of the lure, time to inspect it. No strike occurring, move the bug forward a few inches. If the bass fails to dart at it, again let the bug remain motionless when he may seize it. Repeat the procedure a third time. If it fails, cast to another spot. The writer has found this one of the most successful ways of using the bass bug. When to Set Hook for Bass Select your lure to correspond with the type of insect found on the water and the time of day you,are fishing. In the evening, when bass feed heavily, pick the night rovers of the air, such as grasshoppers, beetles, moths and dragon flies. Lifelike imitations of all-of these can be found in any sporting goods house. Deep pools close to shore are favorite locations for casting your floating lure in the evening. At that time all manner of life moves to the water’s edge, including frogs, mice and crayfish and the bass is there to catch all he can. Cast as close as possible to the shore, sometimes letting the bait land right on the bank. Pull it into the water to give it some semblance of life. If the bass rises out of the water, creating a disturbance, do not set the hook. It is generally unknown that the bass disturbs water around a bug to wet it down so that Big touskelunge, like the one shown above, are taken with large-size minnow imitations and spoons. This Rainy River guide landed this monster in White Fish Bay, Minnesota. it can not rise. Then the fish turns around and seizes its prey. Attempting to set the hook too quickly is a common fault and the reason why so many big ones get away. It is dificult to give proper directions on this point. It is something that comes in- stinctively after practice. One of the most tempting lures is the mouse imitation, usually made of bucktail (Continued on page 130) Here are three knots that ate very useful to fishermen. -The jam knot is commonly used for fixing the line to hook or leader loop. The waterloop knot is excellent for typing leader ends. Inventions for August The leader loop shown will not slip. 87

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SPORTSMEN’S Camper Kinks That Simplify the Tasks of Auto Tourists HE few short weeks allotted to most of us for a vacation period can: be made much more enjoyable, should we choose auto touring, if we carefully plan ahead of time for the needs of the trip. These suggestions for auto tourists, as well as a few “do’s” and “don’ts,’ have all been tried out and approved by ex- perienced campers. The larder or “tucker box” is perhaps the most important part of the camping equip- ment. Always carry. at least a (Continued on page 128) Carry good supply of gro- ceries, so you can stop off at ideal but out-of-the-way camp spots like that shown above. Inflate spare tire to double pressure at filling station before stopping for night, then use excess air to fill air mattress, Get hose fittings at auto supply store. a “REMOVABLE PLYBOARD TUCKER BOX ON THE LEFT RUNNING BOARD OF CAR PERMIT REAR DOOR TO OPEN SHOWING HOW CHEAP NESTING SETS ARE CANNED ASSEMBLED IN THE TUCKER BOX WIDTH SAME RUBBER BOOT LACES AS THICKNESS c ARE INEXPENSIVE = - BOOT CAN BE REMOVED. WITHOUT LOOSENING AND COMFORTABLE. . Bs OHE EYELET LACING 88 Modern Mechanix and

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RR Fishing Handikinks That Will Save Money for the Angler ISHING rods, be they bamboo or steel, are a vitally important part of any angler’s kit. The long bamboo pole with- out frills will always be a favorite with followers of Izaak Walton, but this fact remains—it is a nuisance to carry around. If one has a car, a pole carrier can be fashioned in a few minutes out of scrap pipe fittings. This carrier bolts on to the front and rear bumpers, and so can be removed very easily. The poles are tied in the forked tops of the pipes. Below: When rod ferrules stick, warm joint with match, then hold behind knees, straighten knees and spread them apart. ROD a JOINT HELD x BEHIND KNEES To make adjustable anti-backlash drag for reel, solder 3⁄4” length of valve stem to end plate. Cut off valve as shown below. Turn with valve cap to adjust pressure. VALVE AND == VALVE STEM ~ Inventions for August Method for carrying fishpoles. Slot pipe to slip over bumper. Split top end of 1⁄2” pipe to form fork. eR ae TT, : PRESS BROKEN STEEL OGETHER SHAFT AND SOLDER LIQUID SOLDER ON ENDS OF WIR TO. DISJOINT BAMBOQ So WOODEN *—TAPE. PLUG To repair broken steel rods, get length of spring steel wire which’ just fits inside rod. Smear liquid solder on wire, press into broken rod ends, and smooth joint. To make joints in bamboo pole saw into 4-ft. lengths at knuckles, drill holes, and glue in wooden plugs which make snug fit. FINISHED Bamboo poles can be readily disjointed and carried inside the car. Drill 4” deep holes, and glue wooden plugs into one end of each section. Reinforce the bamboo ends with tape or stove pipe wire. 89

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streamlined SCOOTER Steers “Tear drop” streamlining with airplane type control gives this cabin scooter an appeal that no boy can resist. Young and old alike will stop to watch when this streamlined pushmobile job is brought out on the sidewalk for its first test run. 12 PLY MOUNTING BOARD OR SHEET: METAL COVERING > PAINT: CAR WHITE. CUT BOARD: OR ALUMINUM THEN 5 AFTER IT I. APPLY VARNISH a CES ON. rxn ae = = 3 Have youngster for whom scooter is built sit up against the plywood panel. Draw an outline for the streamlining which will allow him full head room when sitting. 2=\"X9" SHIPLAP BOTTOM —_— ADDITIONAL ESS CLEAT FOR Bey FOOT REST Both skates move parallel to each other for steering. Middle cleat, to which backs of skates are screwed, slides freely between front and back cleat. Lubricate DRILL HC é See Back view showing plat- the wood with laundry soap. TOE OE STE ee TAO form just back of seat. O GREAT is the appeal of this new varia- View of completed tion of the old time roller skate coaster car: abana se soi that youngsters will swarm out from every- it easy to push this where to watch it, to push it, to ride in it. cabin ecooter dows Perhaps it is the snugness of the little cabin that appeals; perhaps it is the air- plane type control which is the piece de re- sistance for everyone who has ever hank- cred to be a pilot; or perhaps it is that we are “tear-drop” conscious, because of auto manufacturer advertising. Anyway young and old alike stopped to watch when this streamlined cabin scooter was “put out on the road” for the first tests. The cost of the scooter is negligible. Enough roller skates for the entire job can be purchased at a dime store for 40 cents. Any lumber yard will supply %4” fir ply- o0 Modern Mechanix and

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with AIRPLANE JOYSTICK by WESTON FARMER wood for the sides, and the rest of the lum- ber is generally in the scrap heap. Cut out the two side panels first, tacking them together lightly so they can both be sawed at the same time. Lay out streamlined design so there is no wasted space, but still sufficient head room and leg room for the biggest lad that will use the scooter. After sawing out the two panels and cut- ting out door and windows as indicated on the plans, make the bottom of the coaster. Match together enough boards for a plat- form 18” wide and 30” long—if you use shiplap and trim off the outer laps but two boards will be needed. Screw 1”x4” cleats across the bottom, using two at the front for the steering arrangement. When mount- ing the rear skates on the cleat, bend the heel portion of the skates in a vise to fit snugly around the cleat. Fasten the skates in place with screws. , The only complicated part of the entire construction is the airplane type steering control—-and it isn’t at all hard to make. Rear skate wheels are screwed to scecter at two points. Below: Use 14" fir plywood for side panels, sawing out beth at same time with compass saw or bandsaw. Fasten hinges in position before sawing out door, for accuracy. HERS PURTFORM Inventions for August Drill $” holes in the toes of the two front skates, to serve as pivot holes. Cut out a hole in the sliding cleat for the end of the steering lever. Put heavy screws through the adjusting slots of the skates into the middle cleat, lining up the skates first. Mount the joystick between two braces, using a quarter inch bolt for a pivot, and the steering joystick is completed. Next set in the seat, slanting it at a com- fortable angle. Nail on the sides with 7 penny box nails, being sure they are paral- lel. Use 1”x2” spacers along the top. The covering can be of heavy cardboard or tin 24”x36” in size. Use %” large head brads or tacks, not the pointed carpet tacks. The car is ther ready for painting. White makes the best color, but any other color scheme may be used to suit the fancy. With friends taking turns pushing and riding, the lad for whom this coaster is built will be the envy of the neighborhood. Ji SECTION THRU THE Y PLATFORM Be 174" FIR PLYWOOD SIDES PHOTO SHOWING MOUNTING OF REAR SKATE WHEELS Left: Bottom view showing steering arrangement. Above: Spring door latch is riveted to door; door stop is nailed to inside of side panel. Cut joystick out of %-inch fir. 91

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UT GUARD N Making a Hacksaw That Cuts Sheet Metal T IS very difficult to cut sheet metal with an ordi- b TO THIS SHAPE KE i nary hacksaw. Take an old hand saw blade and

Cutting Glass OFTEN. when a piece of glass must be cut, no glass cutter is available. File a small notch in the edge of the pane to be cut. With a red-hot iron rod about Xs” in diameter trace the line or design you wish cut, using a ruler as guide if necessary. A crack will start at the notch and follow the hot iron.— IN BLOCK OF H. Arrall. „r „STEEL

a jiffy—J. C. Kauffman. Clean Paint Brushes With Soap and Turpentine E YOU have an old paint brush with hairs brittle and hard, this remedy will never fail to make it soft again. Fill a can with enough water to cover the bristles. Dump about a tea cup of any soapy, strong washing powder into the water, and add about a tablespoonful of turpentine; heat until the mixture boils. Work the brush up and down against the bottom of the can continually, spreading the hairs as much as possible, until all the old paint is loose. Wash in cold water to remove all the soap.—H. L. Zimmer. Tubing Holds Screws cut out to the shape shown. Leave lugs on each end which can be rolled into loops and riveted. Ordinary hacksaw fittings can then be used, including the handle. This saw will cut even the heavier grades of corrugated iron without pinching.—A. H. Waychoff.

Punching Small Holes on a Drill Press DRILL press may be used to pierce small holes in thin sheet metal or in material which is hard to drill. First drill the required size hole in a block of steel. Remove the drill and grind the plain end flat. Replace the drill with the flat end down, line up the drill with the hole in the steel, and you have a punch and die which will pierce out.a neat hole in

OR starting screws in hard places, nothing can beat vawen YP Fins little idea. Slip a short length of rubber tubing W. H. Anderson.

puis handy torch uses gasoline for fuel, giving a steady jet of blue flame which is ideal for light: soldering. Get an old tire pump and saw it off about 6” from the threaded end. Drill a %” hole in the cap and solder in a short pipe for the wick. Solder a disc of sheet metal to the bottom and a length of small copper tubing to the barrel. Roll a piece of cloth into a wick and push it through the top pipe. Fill the torch with gasoline, light the wick, and blow steadily through the copper tubing.—Bob Youngquist. over the bit of the screwdriver and over ihe head of the screw. Use a piece of tubing small enough so that it has to be stretched a little over both screwdriver and screw head. This holds the screw securely so that it can be started in the most awkward position imaginable.—

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Good Grounds Improve DX Reception of Any Receiver TO GROUND ON NE RADIO SET = EE AY a3 AGA 3 GROUND WIRE FASTENED TO PLUG IN STEAM INLET FILLED WITH CHEMICAL: SOLUTION +: oh r FT. LENGTH OF INSULATED FROM CLEAN GAL. IRON OF WE 2 OR BRASS PIPE .Run insulated wire “ to stake at bottom of deep well for Static-free ground. — IRON POST SHOVEL IN MIXTURE OF CHEMICAL AND EARTH Any of above grounds will improve radio reception, bringing in real DX. sulphate and salt mixtures lower ground resistance and keep it at constant value, Copper reducing static, especially on short waves. Moke and more, radio engineers are recognizing the fact that a good ground is absolutely essential, especially for real DX on the short waves. Experiments have proved that a radio ground established far down into the earth, - with heavily insulated lead-down wires, keeps radio static down to a minimum even during thunder storms. Be sure the wire does not touch the walls of the well. An electro-chemical ground is easy to make. Dig a 6-ft. hole in damp ground, and place in it a length of copper or galvanized pipe having a number of %” holes in it. Mix up 3 lbs. copper sulphate, 5 lbs.. rock salt, and 3° lbs. pulverized: charcoal with the earth removed, then tamp down in the hole. Fill the pipe with water every week. Clean all paint off an old steam-radiator or water tank, plug up all: openings, and bury in' damp ground. Fill with.water con- taining the previously mentioned chemi- cals, leaving out the charcoal. Replace the evaporated water occasionally. ' Inventions for August Stopping A.C. Hum With Tinfoil MA! radio experimenters using the new a.c. tubes in regenerative short wave circuits are finding hum very annoying. It can be reduced considerably, however, by winding strips of tinfoil around all leads carrying alternating current. The foil can be grounded with a flexible wire and a drop of solder. Use. insulating tape under the foil where there is danger of a short- circuit, and espe- cially near bind- ing posts. Results will be gratifying. This kink works very well on short wave sets that show a body capa- city effect. TO GROUND... SOLDER TO TINFOR - 3 INFOIL MP WIDE N o STRIPS OF

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MOULDS AFTER BURNING ---7 TREAT “MOULDS WIT `a, SOLDER FIRMLY Sketches showing making and pout- k ing of mold are at upper left. Use y. f only battery metal in pouring. Solder 10” leads to outside cells of tray. Con- nect all cells in series for radio use, as shown at upper right. Connect leads to charging strip as at right for charging. Keep batter- ies in basement, as close as possible to radio, Build a Heavy Duty Power Supply HIS power pack will deliver approxi- mately 500 volts at 200 milliamperes, enough to operate a small transmitter. Use a power transformer rated at 600 volts each side of the center tap. Because of their cheapness, two 5Z3 tubes are used as half wave rectifiers. As such they will easily stand 1000 volts. The filter condensers will have to stand up on 1000 volts. If electrolytics are used, connect two in series as shown. ‘44 AMP. FUSE OR FLASHLIGHT BULB ~~ a SWITCH BLEEDER-~ 50,000 OHMS 30-35 MILS.\ PLATES TIED y TOGETHER “S—S15 HENRIES WO VOLF 60 CYCLE .5 VOLT-6 AMP. FOR RECTIFIER TUBE FILAMENTS IF ELECTROLYTIC CONDENSERS ARE USED- USE TWO IN SERIES EACH SIDE OF SECOND CHOKE 94, n [fey 8 PLATES {CONNECTIONS FOR CHARGING WATER GLASS \ EE by t N, aos aos —j- A O s “O B Ci t e, j CONNECTIONS TOeRouno OS SERVICE ” BOX PAINTED WITH ` ASPHALTUM PAINT HIS wet type B battery entirely elimi- nates the B battery nuisance of old radio sets. _Saw off the plates of an old car battery— use good plates even if you have to buy a cheap, new 6-volt battery. Allow the plates to dry thoroughly, then cut a section 13%”x2” from each corner. Burn out the mold for the plate couplings, after setting in the aligning dowels. Place the mold in a vise and pour in melted bat- tery metal. Use acid core solder in solder- ing the couplings to the plates. Pint beverage bottles cut off 44%” from the bottom are ideal for jars. Build a wooden tray for the jars. 24 units should test 60 volts when charged, each jar being 2% volts normally. Clean the glasses and plates in rainwater. Arrange the plates according to the diagram to secure the correct polarity. Separate the plates with glass panes. f Get sulphuric acid at your garage, and dilute with rainwater until it tests 1250 with a hydrometer. Don’t pour water into the . acid—it will explode. ' Fill each cell until the plates are covered, . then pour a thin film of clean oil on top. For charging, the batteries are connected in parallel banks of four cells each, and connected to an auto generator. Modern Mechanix and

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Sliding Rod Antenna Is Tuned to Stations to Stop Static HERE space for a receiving antenna for a short wave set is limited, this sliding brass curtain rod is ideal. The length of the rod is changed to tune the antenna to the station. A variocoupler connected in series with the antenna further tunes the picked up signals for loudest reception. An antenna like this greatly reduces static impulses and other interfering noises. Though the volume obtained is surpris- ingly good, it is of course not equal to that to be had with an overhead antenna. A double throw switch can be used for switch- ing to a regular antenna when reception is free from static. In tuning slide the rod up and down and adjust variocoupler until reception is best. Scratch Filter for Phono Pickup ANY of the old- er stylephono- graph pickups have no scratch filter, but one is easily constructed from a few. spare parts. Wind about 200 turns of No. 30 d.c.c. wire closely together on a card- board tube 1” in diameter. Connect this in series with eee the plate of the tube to which pickup is connected. Connect two .005 fixed condensers in series across the choke coil. Run a wire from the center of the condensers to the cathode of the tube. Test Condensers With Light Bulb A TEST light is always handy on the radio workbench. With it you can make many continuity tests, and even check con- densers. Connect a pair of test leads with clips to a bayonet plug, placing lamp socket in series with one of the leads. To test con- densers plug into a 110 volt source, and connect clips to the condenser. If the bulb lights up the condenser is shorted. If it flashes for an in- stant, glows faint- ATO PHONOGRAPH: PICKUP condenser is good. Inventions for August ly, or is dark, the: SLIDING BRass | CURTAIN | ROD : Rod antenna may be fastened to window frame. Mark set- ting cf rod for each station. Use 3 rod lengths if needed. Winding Filament Transformers HE cores of old audio transformers are often large enough for filament trans- formers. Use the fibre core of the old wind- ing as a coil form, winding the primary on first. Run the winding across, but do not mind if the turns pile up on each other. Place a thin sheet of wax paper between each layer, and heavier insulation between primary and secondary. Measure the out- put voltage with a voltmeter, adding or sub- tracting turns to get the correct voltage when filament is connécted. Make a wood coil form and mount it in a breast drill held in a vise. INTO WOOD FORM CSAW OFF HEAD) ] REVERSE LAMINA- TIONS FOR EACH LAYER Add 10% to filament wattage for losses to get primary watts. Multiply turns per volt given above for needed wattage by voltages to get turns per winding. Compute currents, and select correct enameled wires from wire table. 95

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Animated Lawn Gadgets Sway in Wind 3) = by A. NEELY HALL IRDS and animals jig-sawed out of wood and mounted so that, with the slightest breeze, their bodies will sway, or their: heads will nod, are a novel form of gadget to add interest to your garden. The three simple models shown: here will suggest other subjects equally easy to make. Box boards, worn-out hacksaw blades, and other by-products of the house and shop furnish the working materials. Lay out the robin upon a board % inch thick, following the given pattern. The pat- tern may be enlarged directly upon the working material, or upon cardboard or wrapping paper, then transferred. The latter method provides a pattern for dupli- cate cut outs. Draw the squares of your enlarged pattern 1 inch across. When you have cut out the bird block, smooth its edges with a file and sandpaper, and bore a %” hole where indicated, for a dowel peg. Make the dowel 1” long, and slot two-thirds of its length. Slip a hack- . saw blade end into the slot, coat the dowel with glue, and drive it into the bird block. Cut the stake support about 16” long. "= Taper the bottom, slot the top to receive $ (Continued on page 126) . Lawn goose wags its head when wind blows. Make two wing sections, nailing one on each side of body section. Goose is supported by dowel extending into one leg. 96 Modern Mechanix and

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Keep Rooms Cool in Summer With This Attic Ventilator “SECTION THRU no VENTILATOR: TE attic is generally the hottest part of the home in summer. The sun beating down all day long on the roof concentrates the heat here, making the rooms below very uncomfortable during the night. This concentration of heat in the attic must be removed before living and sleeping rooms can be made comfortable in the summer, This ventilator, designed along the lines of the barn cupola, will draw heat out of the house. Only one need be installed on any roof; with a little care the ventilator can be made to appear an integral part of the house. The unit is made 14” long, to just fit be- tween the rafters. The ends are of white pine, and are saw-kerfed to receive the metal louvers. Removable shutters which seal up the ventilator for the winter also slide in saw kerfs. If simplicity is desired, a metal roof may be used. Many prefer to use a boarded roof, finishing with shingles to harmonize with the home. Give the entire unit a coat of aluminum paint, and then decorate in colors to match the roof. When mounting the ventilator use plastic roof cement at the joints. If using. the ventilator on a two-story house, leave the door to the attic open dur- ing the day to give a better draft. Inventions for August SAW-KERFED l + TO RECEIVE MEY 7 AL 22" 7" LOUVERS SAW-KERFED IN WHICH THE WINTER SHUTTER SLIDES DETAIL OF WOOD END SECTION Small electric fan mounted beneath ventilator will force out hot air on calm days. Bend louvers at upper ends 19 keep out heavy rains. Use screens to keep out insects. Vases From Phonograph Records Flower vase holder made by heating and bending old phonc- graph record. Edges may be painted in any color scheme. LD phonograph records, when heated with hot water or held over a gas flame, become pliable. Vases and nut dishes can be made by softening record, placing bottle in center and molding edges to desired design. Finished vase will have lovely velvety finish, and may be painted. Dip the vase in warm water after form- ing to relieve strains. 97

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“Real Glying ‘Ohrills Are Yours STREAMUNE Ihi NAIL AND GLUE h Es é IF DESIRED | — {iy r ALL JOINTS ⁄ SUGGESTED | \ - St i Le Ay 12” DIAM. METHOD OF i i i : J Zane CONSTRUCTION à TO ELEVATOR DETAIL i OF CABLE ai] | HORNS yon) À CLOTHESLINE | AILERON SHOCK CORD \ PULLEY LARGE SCREWEYES STEEL TUBE CONTROL DETAILS PLACE MARK JUST ABOVE MINIMUM AIR A SIMPLE AIR-SPEEO INDICATOR Constructional details for trailer plane ate shown above. Straight-grained spruce should be used for all important members, and any light, straight-gcained wood for other parts. Strips of inner tube may be used in place of shock cotd to cushion landings. Airspeed indicator shown above will prevent crashes. It may be calibrated against speed- ometer of car, Strong disc wheels with rubber tires are necessary if towing plane considerable distance on the ground. 98 Modern Mechanix and

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With this Captive Plane Zoom and bank in this trailer plane, with none of the dangers of real flight. No license is required. ITH the long summer days at hand thou- sands of air-minded boys will welcome this practical little trailer plane. It is simple to construct and enables anyone to pick up the essentials of airplane control with a minimum of risk and cost. Being entirely dependent upon a tow car, to which it is securely attached at all times during operation, and being definitely limited to a prescribed area of actual manip- ulation, the dangers ordinarily connected with preliminary flight instruction are com- pletely eliminated. Furthermore the plane itself does not have to be stressed to any particularly high standard of structural safety (though com- mon sense dictates sturdy and careful con- struction). The plans on the opposite page provide a method of construetion which is unique in its simplicity and strength. They are more than adequate for the purpose intended. As will be seen from a glance at the dia- grams, either of two hitches may be em- ployed. In practice it will probably be found that both are needed: The double- boom hitch limits movements of the trailer to simple up and down flight and is recom- mended for the rank novice who has yet to master the intricacies of lateral control. Advanced “students” will revel in the free- dom of movement which the single-boom flexible-joint hitch permits. Lateral control and even ‘banked turns are possible with this hook-up. As the plane is at all times within easy speaking distance of the tow car, instruc- Inventions for August by DOUGLAS ROLFE TAPER BOOMS TOWARDS AXLE- HITCH TO REDUCE WEIGHT THIS END A LIGHT ` TRUSSED SINGLE BOOM PERMITS FREER RANGE OF ACTION AND REQUIRES ACTUAL FLYING SKILL TO HANDLE SAFELY. No special knowledge of aviation is needed to build or fly captive plane, nor is license required. Auto is power unit. tion can be given during “flight” and errors of control pointed out immediately they become apparent. Any sudden decrease of speed by the tow car should be avoided while the trailer is aloft. A good plan is to have a second man in the car ready to signal any intention to slow down or stop. This will give the stu- Io ample time to put the nose down and “ and.” Better still, a simple air speed indicator can be made as shown in the drawings and the student coached to set the ship down the moment the pointer passes the mark indicating danger. This mark should be predetermined in actual tests to ascertain the exact speed required to maintain flight. This training plane is designed to oper- ate at speeds not to exceed 30 miles an hour. Unless a stronger and altogether more am- bitious type of plane is used this rule must be rigidly observed. As a matter of fact it may be said that no more speed is necessary than slightly over the bare amount required to keep the trainer in the air. Play safe and thus avoid trouble. The actual method of construction is cov- ered in the plans. It will be seen that the (Continued on page 126) 99

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Roof Awning Cloth. Keeps Workshop Cooler CANVAS roof awning built on a light wood frame will keep a workshop or summer kitchen under a « . flat roof at least ten degrees cooler in summer. This type: of roof protection is. used. extensively.on houses and; barns by ranchers in the. super-hot. Imperial. Valley. of California. Tack white awning cloth to the framework’ to provide a 12” air layer just-above the roof. Keep the ends. open for air circulation. “White pine %”x2” will be ideal for the framework and for the brates. —Hi Sibley. : Coat Hanger Makes 2 Hindy Garden Hose Suppan T GOME sort of hose support is needed when using a nozzle on garden hose to water the flower bed. An ordinary wire garment holder bent as shown at right will be found handy for this purpose. Make a snug fit around the nozzle, and straighten out the hooked end which is to be pushed into the ground.—o. Edlund. Tin Guard for Lawn Sprinkler Is Easily Made ; T IS a real problem to water the lawn thoroughly in all places with the circular sprinkler without wetting the sidewalk or house. To overcome this difficulty make a tin deflector to. fit around one side of the sprinkler. If a large enough tin can is available, it may quickly be cut down to the desired shape, using the bottom and one side. Bend the-top of the guard as needed to. keep the water off the sidewalk as shown at left.—L. W. Degree. Ss . Preserve Candles in Warm W eather VES" people on returning from their vacations find that all the candles have: lost their shape. If these bent. candles are hung up in a warm -place by tying strings to the wicks, they will be in-their original shape in a few days. It will be even better to hang the candles up in this manner before the warm days come, for then there will-be no bend- STRONG TACKS, 5 TIE +] FII STRING 5 TO CANDLE WICK - a ing—R. H. Johnstone. - CANDLES | Slat Awning Keeps Store Windows Cool AX AWNING Bich will protect the show windows of stores, keeping the direct sunlight from fading materials and melting perishable products, but still provide indirect lighting for the displays is badly needed during the hot summer days. An awning made up of wood slats mounted side by side on a slant is ideal for this purpose. The sun’s beams strike the upper surfaces of the slats, reflect off to the under surface of the adjoining slat, and then go down to the window.—E. F. Folger. Mest overflow pipes on garden fish ponds soon be- come clogged with leaves, litter, or moss because of the need. of a screen across the opening. By fitting two elbows and a short section of pipe to the outlet as shown the opening is under water where. there is no debris. It is important to drill a %” hole in one élbow, above the pool level, to prevent any siphoning action. The pool may be easily drained by closing off this hole with a petcock, and letting water siphon out.—K. W. James. Novel Pool Drain wy PETCOCK AIR 46) VENT- -TO % * OUTLET Ñ A INTAKE 100 ` Modern Mechanix and

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Find Gold With eMagic Black Light Box Above: Pane of pur- ple ultra heat-resist- ing glass is fitted into grooves in top of box —piece costing about one ‘dollar is large enough. Right: Mount ordinary hand magni- fying glass over pur- ple glass as shown,- so it can be adjusted to any position. Cut hole in side of box. prac light now makesitpossible to match strange ores with known specimens. Under this ultra-violet radiation gold ores will glow in a characteristic color and brilliance which is easily identified. The black light box is made of pieces of cigar box wood. Paint the inside with dead black paint, and make a small hole in the hinged side. A pane of purple glass is fitted into the top to cut off all but the ultra-violet or black light rays. An adjustable magni- fying lens mounted above the pane concen- trates the rays of the sun. A box of assorted, labeled ore specimens must be obtained to start with. Select from the box a sample which most resembles the piece of mineral being tested. Place both in the box, adjust the lens to catch the great- est possible amount of sunlight, and look at the ores through the hole. If the strange ore gives off a fluorescence similar to that of the known specimen it is instantly iden- tified. Otherwise try another sample. Be sure to view a strange ore specimen from all sides. One piece may glow with several different colors, indicating a mix- ture of ores. The indoor experimenter can use an arc lamp as a light source. Forgeries can be detected, oil made luminous, and secret writing inks made visible. Inventions for August Look at mineral samples through small hole in box; if they glow in same degree and color they are the same composition. Cigar box con- taining labeled specimen ores is used with magic box to identify unknown ores. Placing piece of strange ore in box with known specimen. Inspect ore specimens from all sides before discarding. 101

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Make This Gay Cabana for Your Swimming Beach Th brightly colored beach cabana makes a cool retreat from the sun for two or three persons. Sew together burlap to form a shelter 5’ long by 4’ deep by 4’ high. Clean the sacks, then dye them either red or green with a strong aniline dye. Use saplings with sharpened ends for supports.—E. Van Horn. Simple Wire Gadget Picks Up Golf Balls pas little dee can be twisted together out of scrap wire in a minute. With it you can recover golf balls from gopher holes, pick up articles dropped in wells, or even recover corks which have been pushed into bottles. It may be necessary to slip a heavy nut above the prongs to give added weight. Adjust prongs to size of object being recovered.—E. Felsfar. Uses for Clamshells XCELLENT spoons, knives, and forks can be made out of clamshells. Scour the backs BALIN with pumice stone, and polish HOLES | the pearl-like inside lining. Drill small holes through each shell, and rivet on wood or copper wire handles. Grind the forks and knives down on an emery wheel, and saw out the tines with a hack- saw. Clamshell cutlery is ideal for camp.—G. E. Vance. Tape Spool Makes a Good Fish Line Holder To. ELIMINATE tangled lines in your tackle box, and to carry fish lines in your pocket without getting the hooks caught, wind your line on an empty adhesive tape spool. The metal shield which comes with the spool] keeps the hook in a safe position.—oO. E. Olson. How to Make a Diving Board for the Raft IL barrel diving floats have a tendency to bob up and down on the water in the slightest wind, and to almost tip over if a regular diving board is used on them. Four sacks filled with sand and tied to the corners of the platform about 3 feet below the surface will greatly increase their stability. If the raft still bobs about with the regular diving board, try mounting an old buggy spring on one edge of the board and fastening any wide board across the raft from the spring to the opposite edge.— George Scullin. PRONGS id CLAM SHELLS U-BOLTS an Driftanker Keeps Boats Facing Into Wind FLOATING anchor will keep a drifting, disabled boat facing into the wind. Small boats navigating larger bodies of water need driftankers just as much as do freighters or steamers. The conical canvas bag, with an opening 2 to 3 feet in diameter, should be: well sewed to stand the strain. Wooden sticks may be used to spread the opening. Bag is kept float- ` ing.on one corner with the aid of a buoy or lifesaver, and weighted down at the opposite end.—I. Kaho. 102 Modern Mechanix and

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EMOUNT Chis SAIL on YOUR BIKE and COAST along ‘BEFORE the WIND B - B D igo ey “J by HI SIBLEY TRAVELING WITH THE WIND === % t SS S HERE is a bicycle sail that does not ob- DIRECTION X DIRECTION S -~ TACKING struct the rider’s view, and still has a E A N “AGAINST THE- generous spread of canvas. It maneuvers ` \ W Ge Gi Ci N , exactly like a sailboat, and is not likely to capsize the rider even in a strong wind. SANGER ON A good quality muslin or regular tent canvas may be used for the sail. Sew all edges, leaving a hem at top and bottom large enough for the spars. Holes are cut in the hem at the center for the ropes which bind the spars to the mast. Eyelets for the guy ropes are fastened in each corner of the sail. CLOTHESLINE CLOTHESLINE j & DETAIL OF : v4 a4"x 2" 2 CLEAT crame / Yuet A OMAST — > BOTTOM BOOM HOW i ; TO |! LLED UP ON TOP SPAR SECURE vee? io) Use spruce for booms, and bamboo {USERS or 1” renee, stock for, mast and B A spars. Cleat clamps which hold sai! $ = é P whittled out of wood, Mast turns oosely in wood socket Diocks at eac z = METHOD OF RIGGING TO end. Bind ends of spars with wire 1-172" X 2" X "WIDE: —BICYCLE FRAME nme EARS in adjustment may be bought or oc use ferrules to prevent splitting. Inventions for August 103

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Floating “Drydock EASILY ‘Raises Boats by ROBERT G. SILBAR 3” X 3” BOLTED ELBOW JOINT THRU PIPE TURNBUCKLE i Ji HEAVY CHAIN = OLD FIRE be 4 HOSE -À 2” PIPE THREADED INTO BUNG HOLE OF 50 GAL. DRUM Fasten light pipe diagonally to cat- walk and pipe upright to give rigid- ity, flattening ends before bolting. Use wood spacer across cross pipes. LAST LINK OF CHAIN BOAT BACKED IN — DOCK SUBMERGED DOCK FLOATING EMPTY = SLINGS HANGING FREE na SLINGS PULLED -TAUT — BOAT PARTIALLY LIFTED MEN GET OFF- DOCK RISES, LIFTING BOAT Sketches show how floating dock lifte boat. Men standing on catwalk and pulling up on chains depress floats. When they step off, the dock rises, lifting boat clear of water. 66F)RYING OUT” a sailboat before a race is a practice followed in professional ` circles which the amateur seldom takes into consideration. A sailboat left in the water for any length of time absorbs water, no matter what type of paint or finish is used on the hull. Where regular dry-docking facilities are not to be had, a floating dry-dock easily made out of scrap parts will prove valuable. Use four 50 gallon oil drums for the floats. Screw two U-shaped cross members made up of two inch pipe into the bungs of the | drums, making the arch high enough to ciear the sail boom of your boat. Bolt 2”x6” planks along both sides of the dock for the catwalk. The sailboat is backed slowly un- 104 FLANGE UNION 2”X 6” PLANK SECURED TO BRACES FORMS CATWALK | 2" DIAM. PIPE LAG SCREWS FLANGE ON ty all 3] ans BRACE PIPE SCREWED TO` 1” PIECE Í FITS UNDER CATWALK CHINE OF 50 GALLON Í DRUM Rj €— DRUM Use tie rods on each side of 50-gallon drum to hold in place. der the frames and over slings made of heavy chain covered with old: fire hose. Once the boat is in position the slings are pulled taut and fastened to the U-frames. The slings.are slipped under the boat simply by standing on the drydock. The buoyancy of the floats is almost enough to lift the boat. The weight of the dock, subtracted from the weight of water displaced by the floats when they are de- pressed, is equal to the weight of boat which can be lifted. Pulling the slings taut by men standing on the catwalk lowers the drums still more into the water. When the men step off buoyancy will lift the boat clear of the water. The sailboat shotld hang two inches above the water surface for 24 hours pre- ceding a race. It will then be much faster, because water drag will be lessened. A light set of tackle can be used to lift the boat higher. The tackle depresses the floats even deeper in the water as the ropes ‘attached to the slings are pulled. Release of the men’s weights will lift the sailboat just that much higher. Modern Mechanix and

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Useful Hints for the “Auto Owner CARBURETOR FLOAT LEAKS can edsily be located by removing float and placing in dish of hot water. Note where bubbles appear, remove float immediately, and seal up holes with solder. If considerable water or gasoline has entered, dry out float in oven to drive out moisture before soldering. AND WATER SOL- UTION ~ FUSE which is burned out may be temporarily used by joining end contacts with fine tinfoil as at right. Bi W SEN, > LOCK CAR n | oon S by removing rotor from CORROSION {aeni be rered estos distributor. Rather than k h > a lift up hood to locate terminals with rag dipped in solution of bak- ing soda and water. When cleaned, a coat- trouble, auto thieves will r 3 i i move on to other cars. ing of vaseline will prevent further corrosion, No one can start car un- til distributor is replaced. LEAKS in gas tank are permanently repaired by first thorough- ly drying out tank, then pouring in shellac. Swish shellac around into all cor- ners, then drain and let dry. REFLECTORS faiie can be polished quickly without scratching by rubbing with lamp black and alcohol on wad of cotton. FLOOR BOARD SQUEAKS can be very annoying in any car. Lift up boards one at a time and paint ends with graphite grease- Paint side edges of boards and all parts of car in contact with the loose boards if squeaks per- sist. Graphite in grease will lubricate boards long after grease itself has penetrated into wood. section two INNER TUBE ¿stien so makes handy emergency water bucket which can also be used as container for spare parts. Seal end of tube with tube patches to make bag waterproof. Inventions for August 105

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SPLIT AND GROOVE BEFORE TURNING . 1 a HOLES: A COLONIAL with Adjustable by O. E. OLSON THERE are very few of us who do not ap- preciate the beauty of colonial furniture, especially where design and use are in har- mony with present conventions. In the simple and graceful lines of this lamp some of the spirit of Early America is recaptured. The soft and mellow tone of hard maple lends the final touch keeping it distinctly colonial. * Select clear seasoned hard maple from 3”x3"x33” stock to make the lamp post. Split the stock and saw a %”x4” groove down the center of each piece. Glue these pieces to- gether in their original position and clamp well. This method of making the hole for the light cord is much more accurate than boring, and saves a great deal of time. Use Linseed Oil Finish When the glue.is thoroughly dry set the stock in a large wood-turning lathe and turn to shape. Sand, finish and polish the work before removing it from the lathe. The type of finish may be either French polish or lin- seed oil with rubbed wax. The Jamp support is made to slide freely up or down, locking in place at any desired height. Turn the upper post or slide to a scant 1%” in diameter. Cut the ring lock channel on the circle saw. If this machine is not available cut as you would in making a mortise. Bore the %” lock holes 1” apart taking care that they are in the middle of the channel. Bore %” dowel holes in both ends of the post. In making the ring and lock follow all specifications closely to insure an easily ad- justed and well fitting lock. When the lamp arms are raised the ring should slide freely with a minimum of play. A slight rounding of some of the inside corners may be neces- sary to give smooth action. The arms are turned from 1”x1” stock to an end dimension of %”. The lower arm is somewhat longer and more diffi- cult to place due to the necessity of boring holes at an angle in the lock wB” ——MHM SLIDE C leted bridge 1 shown at upper left. Lamp support arms are fastened to lock assembly which slides up and dow rig center posts techie in lees at any desired height. Any kind of parchment or silk shade may be used on lamp. 106 Modern Mechanix and

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“Bridge Lamp Shade Support piece. Determine carefully the angle needed before boring. Turn the decorative top for the post and the lamp socket block from one piece and separate with the parting tool. Bore holes as shown in the diagrams, using a %” bit for all wire outlet holes. The top of the cricket stool, which forms the base of the lamp, is turned from 1%” stock. Cut the center post hole on the lathe to a snug fit with lamp post, thereby insuring a perfectly vertical post assembly. Cut a template or turning pattern for the legs out of heavy cardboard. Turn three legs out-of 2”x2” stock. Draw them up well to the template for uniformity. Locate and mark positions for the leg holes in the stool top, the legs being equal distances apart. This is simply done by constructing an equilateral triangle on the stool base, each corner thus marking a hole. : Drilling the Leg Holes It is very difficult to bore all leg holes at a uniform angle without a drill press. If such a machine is not available it can be done by making a boring jig from 2” scrap wood stock. Bore a %” hole at an angle of forty degrees in this stock. Clamp the guide secure- ly to the cricket stool top over the leg hole position. The hole in the scrap stock will guide the drill for the leg hole. Bore all of the leg holes in this manner. Glue in the legs securely and test for levelness. In assembling the lamp glue the dowel pins in place and draw all unions tight. Care must be taken that the lamp stands vertical and in such a position that the extension arm is directly above one of the legs. Let the lamp stand for twenty-four hours, or until the glue is thoroughly dry. Then screw %” insulated bushings into the wire outlet holes in the bottom of the post and in the lamp fixture block. To simplify the task of wire threading pass a fine flexible wire or strong string through the post, then draw light cord through with it. Do likewise with the socket block, allow- ing enough free wire to permit adjustment of the extension arm. Use an adjustable sock- et fastened with a : Aa - 2 SOCKET BLOCK 3%” pipe nipple. Circular inset above_shows method of clamping boring jig to base of lamp, to aid in drilling holes for legs. Socket block is bored as indicated for arms and for lamp cord. Standard pull chain socket is. fastened to socket block: Inventions for August 107.

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Travel Light on Week-end Bike Cruises in the Country Eagle Scout Franz Wever travels light on week-end cruises over Minnesota’s country roads. Blanket and poles for setting up lean-to sunshade are tied to carrier. Electric light is used for night travel, Bolt food box to flat type carrier on bicycle. Clinch nuts on stove bolts with prick punch. Use padlock on cover. 3-Blade Hacksaw Cuts Grooves N THE ordinary hacksaw the pins sup- porting the blades are long enough to hold up to three blades. By building up the thickness of the blades in this way grooves of various widths can be cut in wood or metal. A drop of solder on the pins will hold the blades in place or larger pins can be plac- ed. on the hack- saw. BICYCLE comes into its own on roads far off the beaten track, where farm and woodland scenes await the chap who knows how to prepare for a 50-mile week-end jaunt. The experienced traveler goes “light,” taking only those things which he will absolutely need. , For “personals” the following are need- ed: A change of socks, one face towel, one. dishtowel, one large heavy blanket, tooth brush, and first aid kit. Food for 4 or 5 meals will include % lb. of butter, 1 lb. bacon, coffee for three meals, 2 cans condensed milk, % loaf sliced bread, a small jar of Quaker oats, salt, and matches, all wrapped in waxed paper and packed in a big coffee tin. Eggs and fresh milk can be picked up at farmhouses. A few bars of. sweet chocolate will furnish dessert. For utensils take along a drinking cup, a’ small pot for boiling water, a knife and fork and a small frying pan. Tie on the blanket, sling a water canteen and camera over your shoulders, and set off to explore the byways of America! Cabinet Photo Printer Is Handy Store books and photo supplies on shelves of this cabinet photo printer. Use either mask or adjustable printing frame above ground glass. Varnish or lacquer as desired. ITH this photograph printing unit the amateur photo finisher will be able to turn out professional work. Inside the light box are a photographic red light and a 100-watt frosted white light. The red light burns continuously, while the white light is switched on for the exposure by a conveniently located push button switch. The door in the back of the light box must be made light-tight. Paint the inside of the box with aluminum paint to help diffuse the light. A pane of ground or frosted glass is fitted into the top, with an adjustable printing frame permanently fastened above it. This frame will take any negative up to 4”x6”. Modern Mechanix and

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Use Spring Curtain Rod for Drying Films YAWN wees a lot of films must be hung up to dry, it gets 10% SPRING 4 to be rather a nuisance to stick a safety pin into sued each film and hang them up by string. A spring cur- tain rod will prove much more convenient for this task. Mount the spring between two points in your darkroom with only enough tension to keep it from sagging. Bend the spring with the fingers to separate the spring coils, and slip in the negatives. The spring will snap back and hold the negatives firmly. Any onė may be removed at will, or the entire batch re- leased by stretching the spring.—M. Lonn. Acid-proof Wood Trays Ideal for Enlargements MATEUBRS occasionally need extra-large trays for en- largements. Get a piece of well seasoned one inch Redwood or Cypress large enough for the tray desired, and enough 3” wide wood for the sides. Paint edges and ends of the side pieces with white lead and fasten on top of the baseboard with long screws. Thoroughly fill all pores of wood on the inside of the tray with paraffin, using a hot electric iron to smooth out the wax. This makes the tray acid-proof.—H. A. Kay. OR CYPRESS PHOTOGRAPHIC TRAY Ink Drawings on Cellophane for Lantern Slides HEN schematic diagrams are inked on glass plates for use in Jantern slide projectors, the India ink loses its adhering properties and cracks off after it dries. Cellophane takes ink very well, and will last indefinitely if used for this purpose. After the dia- gram is inked and allowed to dry, slip the drawing between two pieces of 7%” glass, cement the pieces together, and place a binder around the edges to keep we, eg A moisture from A, the cellophane.— T. A. Blanchard. Fork Smooths Wrinkled Tracing Paper HEN tracing paper is left on the drawing board over night, it will generally be badly wrinkled by morning. The paper must be pressed down be- fore the drawing can be finished—a rather tedious task when done by hand. Cut a forked branch to about the size used for slingshots, and round off the edges with sandpaper. The two prongs of this wood fork will spread the tracing paper out smoothly, holding the paper down on the board so the lines underneath are plainly visible.—A. R. Jameson. ROUNDED ENDS . « RI MAGNETS FLASHLIGHT BATTERY Electric Shutter Trip Operates Your Camera LEP a, à REMOTE control arrangement for tripping the camera Afo shutter is readily made from an old doorbell and a AN flashlight battery. Mount the doorbell on a heavy block of wood. Run a string from the tip of the armature to the camera lever, and arrange the apparatus so that the camera lever is tripped when the armature pulls in. A push button switch may be used to close the circuit to the battery. With this arrangement self portraits are easy, and animal pictures may be taken from a distance.— C.A. McKeon. Inventions for August 109

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SBUILDING the <BODY of

WINDOW RETAIL STUD DETAIL ; TRIM STUO TO SIZE AFTER BOLTING RIBS IN POSITION

A poor STOP

i uu . 2 Peces $ PLYWOOD q NAILED TOGETHER F HALF ROUND MOLDING 20GA. METAL THRESHOLD & DOOR STOP FITS ROUND STUD BOTTOM CROSS SECTION THRU FRAME AT DOOR WINDOW: AND STUDDING Details of windows and door illustrate construction recom- mended. Flooring is laid to extreme edge of chassis sill frame except at door, as shown, and at wheel wells. Note that window stool and screen frame are hinged to permit window to be lowered. Auto door lock is best for door. 110 A neatly arranged interior, that is far from overcrowded, is a feature of “Aloha.” Here is a view looking forward. Covering the floor with linoleum adds a finishing touch. by ROBERT W. YORK PART II ITTED with a shower, telephone, berths, kitchen and plenty of storage space, “Aloha” without a doubt is the “trailer de luxe” for summer touring. Yet the body construction is no more difficult than the. average trailer. The body is built after the chassis is completed according to instructions cov- ered in Part I in the July issue. Check the chassis to be certain it is square and plumb. The wheel alignment must be true and at right angles to the line of pull, which will be the chassis centerline. Then you are ready to proceed with building up the body. Here a band saw would come in handy but if you haven’t one you will be in no worse position than the writer. It will be noted in the chassis draw- ings, given in Part I, that the flanges of the channel iron face outward. This is in order that a wood member 1%x1% may fit snugly in the channel. This sill may be placed in two ways, either by steaming and bend- ing to shape (see March, 1934, issue of MODERN MECHANIX AND INVENTIONS, page 109), or cutting in the required curve. In either case this wood sill is bolted to the channel iron using 14” stove bolts placed at 2’ centers. Next cut the required number of frame Modern Mechanix and

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“ALOHA” —‘Grailer de Luxe studs. The finished sizes should be 1”x2”x5’- 6”. At the dimensions shown on the plans %x%4x2” cleats are nailed on both faces of the studs to hold the side rail strips and plates. Notch out one end of each stud and the sill where the studs occur to form a snug mortise joint, and bolt the studs to the sill with 14” stove bolts as shown in Part I. Be sure that the outer faces of the studs are flush with the outer face of the sill. Nailing strips are now to be placed where the lower set of cleats occur. To get the correct curves for these members lay the raw material on the sill between their respective studs and mark.the outer curve of the sill at the same time keeping the inner edges in a straight line. Establish the respective angles at the ends for nailing to the studs to form a neat joint. This nailing strip need not be more UNE INSIDE OF WELLS WITH 20GA. SHEET METAL =, LOCKER “Space Se | UNCER BERTH A ae — Lo ONGITUDINAL SECTION SHOWING ROOF TRUSS AND FURTHER INTERIOR DETAIL COVER INTERIOR WITH MASONITE J IRON FRAME 14! 6" (OVERALL BODY LENGTH) than %” thick and occurs only where disap- pearing windows are not used. A study of the details will explain existing condi- tions there. The top side rail or plate members are cut and fitted in a similar manner but inch stock is recommended here. Assuming that all the plate and nailing members are cut, take a pot of water-proof glue and use freely. Then nail the rails in place against the cleats using a fair size finishing nail. Temporarily brace the work so that it does not get out of square or plumb while the glue is drying. The roof is the next step and we begin by cutting the longitudinal truss. member, the.piece that runs from front to rear of the roof. Reference to the drawings will dis- (Continued on page 122) 1-3" (USE FOR RIB PATTERN) CONTINUE MASONITE - SHOWER IS LINED WITH ' OF ZINC PAN SILL CABINET FRAMES a 3 STOCK THRUOUT ZINC PAN "SQ. WHITE OAK FILLER PIECE 7 17° =p 30} : axle WHITE oA LINE RIBS UP SO THAT CURVES ARE UNIFORM BEFORE TRIMMING TO FIT AT INDIVIDUAL STATIONS TO SHAPE AND SPLICED TO- GETHER. TACK LIGHT BATTENS Ve; OVER RIBS BEFORE COVERING WITH 1/2" MESH CHICKEN WIRE COTTON BATTING AND FABRIKOID(sEE DETAIL) oy 203 >g — TOP PLATE OF 2°17 PIECES RIBS ARE OF HALF INCH PLYWOOD 2" DEEP CUT TO SAME CURVE AS FORWARD END OF LONGITUDINAL TRUSS MEMBER STOVE BOLT \ Tuos BOLT OR SCREW TOGETHER NOTCH AlB AND TRUSS. TO MAKE A FIRM JOINT NOTE-USE PLENTY OF GLUE AT ALL ERAME JOINTS Studs, 23 in number, are bolted to chassis sill frame as shown in Part I. Front center stud, attached last, is not fastened to sill but to center rail because of trailer hitch. The pattern for the lengthwise truss of the roof is also used for laying out ribs. Tire pump develops air pressure in tanks under body to force water to the shower and sink, lll Inventions, for August

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8 OZ. CANVAS COVER HOOKED OR LACED TO OUTER FRAME YELLOW PINE ON FRAMI =~ \ lI! SIDE PIECES STRAP pon Jon 2 BENT Bows.of &' STRAP IRON BRACES [IE FX 1g" WHITE OAK TO HOLD SHAPE OF CANVAS COVERING AGAINST WIND LENGTH AND WIDTH TO SUIT TYPE OF CAR—————2=— AT ALL JOINTS TACK OLD CARPET ON CROSS PIECES ROTECT TOP JSS | ROOF BEAM” CROWN WEDGE RAIN GUTTER DETAIL OF CLAMPS 6 REQUIRED MAKE_TO SUIT FROM 3° STRAP IRON Space floor slats of carrier uniform distance apart, screw- ing them to cross pieces. Steam the bows before bending. bea ADJUST FRAME FOR FORE AND APT i CAMBER (Hany) AT MIDDLE JOINT locate the points where the roof beams Wyoming Top as it appeats on the car. holds luggage in place, protecting it against rain and dust. Entire carrier is easily removed when not needed. Canvas cover UT in the mid-mountain states where roads are rough, auto trailers are not as popular as in other sections of the country. Instead about every third car has a Wyo- ming Top built on the roof. With cars equipped in this way the owners can drive without stopping to see if the trailer is still hooked onto the automobile. The Wyoming Top carrier is compara- tively easy to build and is readily removed when not needed. It will carry surprising- ly heavy loads on any car having husky roof beams. By feeling through the top fabric you can 112 cross. Over these beams lay 1”x6” cross pieces, with carpeting underneath to pre- vent chafing. Wedges under the ends of these pieces distribute the load uniformly over the car top. Sides of 1”x8” yellow pine or spruce are fastened to the cross pieces, using strap iron angles to hold the corners together. Any curve of the body can be taken care of at the middle joints, as shown. Slats of %4”x2” spruce are screwed down over the cross pieces to form the floor of the carrier. Oak bows are steamed to shape and bolted to the front ends. These hold the shape of the canvas cover against the wind and pre- vent light pieces of luggage from blowing out. The canvas cover is a refinement that is well worth-while, as it keeps out dust and rain. The clamps which hold the carrier to the car are made of 34” strap iron. On most cars the solid rain gutter makes a fine catch for the hook. Lock nuts will prevent the bolts from loosening. Do not put more of a strain on the clamps than is necessary for anchoring the top. If the rain gutter is weak, as it is on lighter cars, run %4” tie rods down into the running boards to hold down the carrier. Modern Mechanix and

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Swimmin’ Hole Teeter-Totter Gives New Water Thrills _X4°K16'LONG OLD AUTO INNER TUBES USED AS WHITE PINE SHOCK OR_ SPRUCE TWO_UPRIGHT BRACES REQUIRED Fifteen dips a minute into the cooling waters, with all the thrills of diving, are possible with this swimming hole teeter. N THIS swimming hole teeter-totter you can enjoy the thrills of diving and bath- ing almost without effort. You can have great fun swinging in and out of the water, or ducking your friends. The construction of the teeter is not at all hard. Use white pine or spruce for all members to avoid danger from slivers. Round off the edges with a plane or file, and, of course, put on several coats of good boat paint. Broomsticks are used as pivots at the ends, the upper ones serving as hand grips, the lower as foot rests. Old auto inner tubes are used as shock absorbers and to help reverse the motion. Adjust the position of the cleat on the cross arm to change the tension. Install the teeter in about 4 feet of water, where the bottom is fairly level. Use large stones and sand to hold it down. Rustic Log Lamp Ideal for Cabin NLY the light cord gives away this rustic back-woods lamp, for it appears to be made entirely of logs and slabs. Cut a 2” slab from a 14” diameter well seasoned log, Jeaving the bark intact, for the base. Select a 15” length of log for the upright, and bore a half-inch hole for the light cord from the top to the side. Mount a socket on top. Support shade with heavy iron wire. Give lamp a coat of varnish or shellac, Use at least 60-watt bulb in lamp. Tack bark over thin board form for - shade. Inventions for August’ ABSORBERS LA A BASE HELD DOWN BY a SAND OR > ROCK Woodpecker Windmill for Lawn N FAIR weather and foul this novel little animated woodpecker plugs away at his tree, working lazily when the breeze is gentle, and faster as the wind becomes stronger. Painted in gay colors and mount- ed in your garden or on the lawn, he will attract plenty of attention. Almost any scrap wood can be used for the various parts. A length of brass tubing serves as a bearing for the propeller. Stiff wire levers pivoted as shown transmit the motion of the windmill to the bird. Use washers to take up all play between the bird and the base pieces. Mount about six feet above the ground, on a post. BRASS TUBING SERVES AS BEARING FOR PROPELLER Mount fan to face in direction of prevailing winds, or attach vane to keep entire unit always in wind. Cut wood- pecker with coping saw from 14” soft wood. ` Make pivot hole in body of bird large to allow freedom of movement. Adjust piece of bark so that the bird’s bill just strikes it. 113 TO RIBS DETAIL OF WIRE JOINTS

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Collection of Rare Old Watches Presents History of Time A veritable history of recording of time is this collection of watches, dating back to 1575. Upper left: Watch made for King George III of England, and Swiss chiming watch. Stamp Shows Indian Shooting Fish RITISH Guiana announces a new set of twelve stamps for 1934. The central de- signs will be the same as those issued in 1931, but dates will be omitted from the border, and several new values added. Perhaps the most interesting of the set is the 2 cent red showing an Indian shooting fish with a bow and arrow. On other stamps of the set are beautiful pictorial scenes showing natives plowing in a rice field, sugar cane being gathered in punts, and natives conducting business at Stabroek market, Georgetown. The lower values of the set cost but little. The gay colors and beautiful engraving work will add interest to any album page. 114 FoR years O. T. Lang, a Minneapolis archi- tect and collector, has gathered together old watches of every imaginable type and size. Today his collection of ancient and modern timepieces of various countries is so complete that it presents an almost com- plete history of man’s efforts to accurately tell time. Older watches in the collection are now being put in working order by C. C. Cason, (Continued on page 116) Barbados Ship Stamp Is Prized MHERE have , been many beautifully de- signed and print- ed ship stamps, but perhaps the prettiest of them all is the one pen- ny Barbados Olive Blossom stamp issued in 1905. It was way back in 1605 that the British ship Olive Blossom touched at this lovely West Indies isle. The crew of this ship took possession of the island in the name of James I of England. Boy Scouts on Roumanian Stamps HERE is one easily obtained set of stamps which every Boy Scout stamp col- lector should have. A complete set of stamps was put out by Rou- mania in 1930 to honor the Boy Scouts of that country and the world. The 6 Lei stamp shows Prince Carol in his Boy Scout uniform. Other stamps show scouts doing “good turns.”

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Easy to Learn A twenty minute lesson and you’re ready forthe road! That’s how easy it is'to ride the low- swung, self-balanc- ing, easy-to-con- trol Hatley-David- ‘son: Safe! Com- ‘fortable! Speedy! Ride a HJARLEY- DAVIDSON ____----7 NRR thrill to motorcycling! You are master of the road — you zip through traffic, around and past the car parades — you are away and gone into the beckoning countryside — free as a bird on wing! There are good times all the time for the motorcycle rider — club runs, tours, race meets, hillclimbs — with jolly Knights of the Highway for pals. Get a Harley-Davidson! It’s so easy to pay for — costs so little to run. Ask your Dealer about his easy payment plans — and take a demonstration ride! ha Ba One cent per mile with a Single, two cents with a Twin—normal running cost for a Harley-Davidson, and it includes everything ! The savings soon pay for the motorcycle. Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers 115

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Watches Present History of Time (Continued from page 114) expert, Minneapolis watchmaker. Each watch is first thoroughly cleaned, then bit by bit new parts are fashioned to replace those worn or broken. New springs must in most cases be built up by hand, since replacement parts are now iiipossible to obtain. Even though some of the watches are hundreds of ‘years old, they are. fixed up. to look ‘and run “just as good as new.” wall Sweden Issue “Garbo” Stamp? N'a recent con- test conducted by a Stockholm newspaper for a new Swedish postage stamp design, one con- testant submitted this design bear- ing the likeness of Sweden’s fa- mous daughter, Greta Garbo. If the design meets with official ap- proval, it will be issued. Greta Gargo stamp design, sub- mitted in recent Swedish news- paper contest. It is mot as yet approved by postoffice officials, Artist Makes Pictures With Twigs One of three-dimension scenes made from twigs, bark, and forest litter. Roof and foreground are of birch bark. In- set: Woodsman-artist George Pixley, originator of new art. WIGS, moss, and bark are used by Michi- gan’s woodsman-artist to make realistic three-dimension pictures having the beauty of oil paintings. In the deft hands of George H. Pixley, of Harrison, Michigan, a wide board, a pile of forest litter, a few nails and a bit of glue change into a beautiful picture of the out- doors. The grain of the board becomes clouds scudding across a winter sky; twigs change to a log cabin, birch bark to a snow-laden roof, and twigs of squaw pine form trees and shrubbery. ADLETS FOR HOBBYISTS STAMPS ‘ZANZIBAR! Packet queer freakish stamps from Zanzi- bar, Algeria, Sudan, Malay States, Victoria, Gold-coast, Nigeria, British Colonies, Souamericans. Don’t delay! Don’t wait. This whooping packet free for 5c postage. Gray Stampco, Dept. M.M., Toronto, Canada. ALBUM, 4100 Spaces; 1000 hinges; 215 different foreign; 20 airmails; 25 Japan; Tweezers. All for 50c. Approvals. Burtis Co., Saratoga, N. Y 1863 LOMBARDY- VENETIA, Charkhari, Turks Caicos Islands, $5 U. Afghanistan, genuine Baden, and Imper- forate ea ie free to approval applicants en- closing 3c postage! Viking Stamp Co., 1 Hanson Place, Brooklyn, N. PARCEL POST Sct, 12 varieties, Belgian. 4c postage. Wallace, 3636 17th Avenue, Minneapolis, Minn. 500 MIXED stamps, good value 20c to Approval Appli- cants. Western Stamp, 121 West Second, Los ‘Angeles: California. RARE, Complete sets, Old South American envelope stamps only 10c to serious collectors. Fred Walker, 627 South Olive Street, Los Angeles, California. COLOSSAL Packet of Canada and other British Colonials, including commemoratives and pictorials only 10c to ap- plicants for super-foreign approvals, economically priced. Swalley Stamp Service, 1119 Trenton, Los. Angeles, Cali- ‘fornia. SENSATION Facket: Colonials 10c. CHOOSE your premiums! Jungle Stamps! Animal! Bird! Airmail! Triangle and Map stamps! Pick any ten from our big approval selections. Inclose 5c postage. Stamp Importers, Akron, Ohio. Coreas, Liberia, triangles, British . Steele, Springdale, Pa... ‘FREE! Three Spain Airmails or Russia Ethnographic Issue. Postage 3c. Roberts, 901T Fourth, Bay City, ‘Michigan. FREE—To approval applicants. Five beautiful airmails oa five different countries. C. A. Green & Co., Norwood, io -116 Postpaid. , UNITED STATES: $5 postage Jue, 3c. vals. Denne, 8103 Longworth, Detroit. AIR MAILS—PFrom Brazil, Chile, Colombia, Ecuador and Mexico, all for only 10c with our double premium penny approyals. Progress Stamp Service, Franklin Park, Ilinois. MAMMOTH Mystery packet of rare stamps for only; 10¢ to serious approval applicants, also valuable free premiums with every selection afterwards. Our stamps are better and our service is different. Fair-Play Stamp Service} 1215 Browning Blvd., Los Angeles, California. RARE Eight-sided stamp included in “Surprise Packet” only 10c with startling double premium approvals. Bar- ain Stamp Service, 1330 South Hope Street, Los Angeles, alifornia. HIGHEST Cash prices paid for your stamps. Doake, Fresno, Ohio. STAMPS! 100 diff. 2c; 500 diff. 35c; 1,000 diff. 90c. Tatham Stampco, D9, West Springfield, Massachusetts. STAMPS Sent on approval. 50% discount. Fred Herz- berg, 197 Grantley Ave., Elmhurst, Tllinois. a COINS OLD MONEY Wanted. $5.00 to $2,500.00 each paid for old coins. Buying catalog 10c. Robert Cohen, Box 483, Muskogee, Okla. ` at: COINS, California gold quarter size 27c; $% size, 53c. 3c piece and coin catalogue, 10c. 200 different stamps and stamp catalogue, 10c. Norman Shultz, Salt Lake City, Utah. $5 to $500 EACH paid for Old Coins. Keep all old money. Get posted at once. Send 10 cents for Illustrated Coin Value Book 4x6. Guaranteed Buying and Selling Prices. Coin Exchange, Box 17, Le Roy, N. Y. HIGHEST prices paid for Indian Head pennies. dime for list of those wented. Coin Shoppe, 407-MM, Ottawa, Hl. 30 DIFFERENT U._S. stamps and list of prices paid for all Indian Head Pennies 10c. Coin Shop, 2422 Reid St., Flint, Michigan. Foreign appro- Send Box Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers

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AUTOS DIESELS [Fer aiy AUTO DIESEL Auto Mechanic Diesel Mechanic Auto Electrician Fuel Injection The opportunity of a life-time awaits you. High-speed Diesels are heing rapidly develaped for service in trucks, tractors, boats, airplanes, stream- lined trains, pewer-shovels, etc. Trained men are needed. The demand is increasing every mionth, But the expert operator and repairman must first become trained. He must be master of all branches of aulo-repairing ; otherwise he cannot qualify. National Automo- tive School trains you in both trades—AUTOS and HIGH-SPEED DIESELS. You learn Autos and you learn Diesels, hand-in-hand, by practical shop methods under working conditions identical to actual shop practice. Expert instructors teach you individually, GREATER OPPORTUNITY THAN EVER BEFORE FOR TRAINED MEN TO OBTAIN GOOD JOBS Now, for the first time in history, you can obtain training in Auto Battery Expert , Expert and Diesel work simultaneously. National instructors have devoted two years Carburetor Diesel Service to the development of our new High-speed Diesel Course as am added course. When you Man graduato after a few months of delightful tralning, you will be qualified to accept a Expert aye dependable posilton anywhere. National is the only institution offering complete Auto Machinist and Diesel Instruction. NEW COURSES--NO increase in cost for High-speed Diesel Instruction For a limited time, National offers the complete course in High-speed Diesel Engine Training to all students enrolling for automotive training. In other words, you receive two courses for the price of the auto course. This offer is limited and may be withdrawn at any time. The High-speed Diesel Course in- cludes complete instruction in all branches, including theory, design, construction, repair and operation. The Auto Course includes instruction in every branch of autotraining, enabling you to operate your own shop. This is the most complete High-speed Diesel and Auto Course offered any- MAIL where in America, EARN ROOM AND BOARD while learning The majority of our students carn their room and board while learning. This enables those with limited finances to enroll and obtain training at a cost within their reach. We assist students in ob- taining part-time jobs. Full details upon request. MEN OF ALL AGES CAN ENROLL Don't worry about previous experience or whether you are too old or too young. You cantrainunder our successful methods if you are ambitlous toobtain tho vight kind of experience and instruction for a good- pay job. You can take as long as you desire to complete the course. FREE EMPLOYMENT HELP Upon graduation, we assist students in making con- tacts for good-pay jobs and have placed hundreds of WS ca A MILLION-DOLLAR SCHOOL TO TRAIN YOU BY PROVEN METHODS This magnificent institution points with pride to a record of mora than 30,000 successful graduates. It is the largest trade school in Western Amerlea. National’s sludents are sought by many corporations and employers of trained men. You nat only recelve complete training, but are given an unlimited scholarship, per- mitting you to return to the school later for additional instruction if needed. Los Angeles is the ideal place in which to train. 2 . T dl A 2 our students. The National diploma is a certification Many delightful trips to points of scenic interest, movie studios, por! -c $ of ycur ability and helps place you at the head of tho also fishing, mountain hiking and other recreations are arranged \ pa list for employment, Our graduates are located in by the student body. Enjoy fall and winter in Sunny California. q all parts of the country and we shali be pleased ESTABLISHED 29 YEARS AGO to refer you to such students in your locality. National Automotive School was established in 1905, being the oldest trade school in the West. The faculty is comprised of experienced in- structors who are practical men. No tiresome text books are used. Practically the entire training is comprised of delightful shop practice under the watchful eyes of instructors, who teach you, step by step, how to master the the Auto and High-speed Diesel trades. l i SPECIAL OFFER—RAILROAD FARE ALLOWED No matter how rar ra ane Angeles you reside, the cost of enrolling i ag | | Yow as if you lived in California. For a limited time, National will continue i RR n to allow coach railroad fare from any part of the United States to Los Angeles. l Without obligation, please send full details aad your illus- | You will be credited the amount of the fare against the cost of tuition. This trated descriptive catalog gning in na DH ree your offer will be continued despite the fact that the new and enlarged High-speed | school and courses in Auto and High-spee esels, | I l National Automotive School, Dept. MMA-8, 4006 So. Figueroa St, Los Angeles, Calif. Diesel Engine Course is being offered for a limited time, including Auto Training, at no extra cost. Only a limited number of students can be accepled under this special offer. We therefore suggest that you immediately request full details. Simply send the coupon and you will receive the interesting illus- trated catalog and full details about the High-speed Diesel and Auto Courses. NATIONAL AUTOMOTIVE SCHOOL Practical Training in Gasollne.and 4906 So. Figueroa St, Los Angeles, Calif. + —— —— —— — — — __/__ — — __ ____ Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers 117 Name .......+--6 EPIA EE EE Parnas EEI š

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Please attach a letter stating age, occupation, employer’s name and -address and that of at least one business man ag reference. „ESTIGA? Sx JESUIT HIGH SCHOOL FOR BOYS v Many vital advantages. Finest equipment. - Inspiring location, 50 year record of success. Highest academic standing. Preparatory for any 7 college. All sports, including Golf and Ice S, Hockey, R.O.T.C, Send for illustrated literature, Rev. B. J. Quinn, S.J., President CAMPION, Box (9, Prairie du Chien, Wisconsin Weekly AWAY RCA LICENSED RADIOS R.C.A. Licensed Home Model and Automobile Radios and our 10 STAR items all given away absolutely FREE with our new sensational unique PUNCH SALES CARD PLAN. The only one of its kind in the country. With our new 10 STAR SPECIAL everyone is interested. This is the opportunity of the year—make up to $150 cash each week for yourself. Every home, car owner, store, office, factory, lodge, club or in- alvidual_wants these marvelous new FREE R.C.A. LICENSED RADIOS or any of the valuable 10 STAR items listed. WRITE TODAY. FOR OUR 3 NEW il STARTING OFFERS |2 CLOCKS | Start at once making money with our unique sales Plan. Write for full information how ycu can secure FISHING any or all of these plans, DELUXE MFG oie SPECIALS ES wrist WATCH E FG. CO., Dept. 81, 173 W. Madison St., Chicage, MI. Fireworks Magician Tames Dynamite (Continued from page 42) “There are only about 200 really profes- sional fireworks shooters in the United States. Sometimes the green helper is more bother than he’s worth. Down in Birmingham, Ala., one year, I got two negroes to help me set up a show and hired them to stay for the shooting. Night came and the hour for. the fireworks, I touched off the first piece, a set of fast-burning, spark-shooting pinwheels. My trusty aids got into the spirit of the thing immediately. The last I saw of them, they were vanishing into the night at top speed. A Fireworks Flight With Ruth Law “Things are always happening tò break the routine and that’s an additional reason why the work is interesting. I was on a job at Avoca, Iowa, in 1917. I had been in the business just three years. I felt I knew a lot but I got a new idea on this angle and found there was lots to learn. Ruth Law, the famous aviatrix, was there, giving a flying exhibition. She decided to make a night flight with fireworks flaring from her plane, the first time she had attempted such a stunt. “I attached the fireworks to the wings of her plane, one of those old-type pushers with the engine behind and the seat out in front. The pieces were to be fired by electric squibs connected in series to the plane’s magneto. “Want to go along?’ she called to me. ‘I may need some help firing this stuff.’ “T looked at the plane. There didn’t seem to be much accommodation for passengers. “Just hop on the wing there and you'll be all right,’ said Ruth. She was getting im- patient. The old engine ‘was chugging away behind and the crowds were waiting. “I doubt if I would do it today, but I hopped on as fast as I could, tickled to go up with Ruth. I straddled all the wires and other supports I could drape myself around, dug my fingernails into a strut and away we went, into the black night with the lights of Avoca and its fair falling away below us. The Dangers of Flying Fireworks “I didn’t have any time to think about the flight. The fireworks kept me busy. We fired ?em all right but I was worried about the flares. Would they fire all right or would they set the wings ablaze? I had all the confidence in the world in Ruth’s flying ability, but I didn’t know whether or not the fireworks would bother her. The glare and extra wing weight might prove disturbing. x “Everything went splendidly, however. In fifteen of the most absorbing minutes I have ever spent, we were back on the field and the crowd was giving Ruth a big hand. And she deserved it. The stunt sounds rather tame now. Fireworks from a plane are an old story and we know a lot more about. at- taching them and firing them properly. But these were early days in aviation and flying fireworks were a distinct novelty. Ruth Law: proved that night as she did many times be- fore and since that she was a real sports- woman and not afraid of anything.” - Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers

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Put Layers of SOLI on EVERY INCHof Y CAmazing New Home Training Camp Gets Remarkable Results New kind of home | gymnasium quickly Qu ICK builds smashing # muscles and tremendous all-around bodily strength. Rebuilds every muscle. Gives you new stamina, endurance, and never-failing energy. Read the 23 big features you get—more than evor before offered at this price by anyone, anywhere, at any time! OOK AT ALL YOU GET =» = 23 BIG FEATURES— frenest Expander—Ten Cables, 200lbs. resistance. Adjustable to your particular needs, A quick way to build the kind of chest you have always longed to have. 2 > halustable Headgear—for building sturdy, powerful neck muecies. d Foot Gear—for ankles-and calves, ; 4—New .Type Hand Grips—Strengthen fingers, put new forca Lf into wrists, forearme. 5-_Patentea Stirrup— Puts new power into legs, muscles of stomach and thighs. — Rowing Machine Attachment—pgives yon Sus ibeck-Bullding: advantage of this great sport. T-Comp lete Wall Exerciser, Attach- ments——for general body development. x8 — Muscle. Clock — Measures your mascle powers. | Shows whet your muscle power is m junds, —Foot-Gear and Ankle Strengthener — to put new endurance into your ankles and to lift and strengthen your arches. 10-Speciat Skip Rope—for increasing speed and developing your wind. 11722 Famous Wrestling Holds—clesriy pictured and described. 12—25 Secrets of Jiu Jitsu—making you the master of any man, regardless of his size. 13517 Winning Boxing Positions—clearly shown in pictures, 14529 Feats of Strength—tricks you can easily do which will amaze everyone. 1 §—_ Tricks of Hand Batancing—some of the Bai atunta which have astounded you on the re 5 ee 16,2" Food Facts—scientific information told in a simple way. What to eat to create new power and vitality. 17 Specs Ways to Get Bulging Biceps— clear instruction -for using this apparatus to rebuild that specific part. 18—Secrets of:chest Expanston. 19-The ‘Stomach Muscles and How to _ Strengthen Them—aspecial advice on this important zone of the body. š U to Put New Power Into Your Legs and Thighs—many otherwise strong men are weak here. 2 —Hints on Increasing the Strength of Your Back—for greater lifting ability. 99— PRIVATE Letter To Ma jointing dangers and safeguards you should know, for your own protection. 23—Comniete 150-Page Sex Book— simply and clearly written (and illustrated) by great doctor. Straight answers to questions that have pazzled you. d | Send me at once—in a plain, anmarked container—complete home > gymnasium. including all features listed on this page. When package in ef ' i elivered I will deposit $3.95, plus actual Stee t ee i ation, I am not delighted with this complete out- Mail Coupon NOW! rae eaa ou will at onca refund my $8.5 in full. You don’t have to send a penny with this coupon. When this big pack- | SPECIAL: If you act at once you will alsoreceive thls 150-page sex book age is delivered—in its Plain Container—merely deposit the special price ABSOLUTELY FREE! of $3.95 plus actual delivery charges. (This one low price includes ALL | these 23 items—no further payments.) Then if, after 5 days examination, you are convinced that thls complete | home gymnasium will not give you the kind of body you have alwaya longed to have, will not improve your health, increase your strength, and make you a better and more confident specimen of physical manhood—if i you are not posilive that these claims are true, then you have the perfect A d dresin maes Tight to send back all the material you have received and your $3.95 will be refunded in full at once. Complete GIVENESI FREE OF EXTRA CHARGE For Prompt Action THE HOME GYM CO., Dept. 28 _ 131 East 23rd Street, New York City Don’t be satisned with anything less ena, the kind a body you have | City State always wanted! Don’t “‘put ol oing something about it—now when it is (m) 2 i a " . i K i wil —a Check here if you are enclosing $3.96 right WITH this coupon. In that Hae OME ON aC OO Dept 28 rE oad Ste Nee Vere Oe money—at once. Dee rare ihe deliye charges here and you will make this eaving. Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers 119

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/AOWS THE NEW \ CAR BREAKING IN ? ( MAN! IT’S A MIRACLE ! ITS BROKEN IN BETTER THAN ANY CAR | EVER OWNED ! AMAZING LUBRICATION ADVANCE Takes Risk and “Grief” Out of Breaking-in Cars The first few miles you drive your new car may take years off its life and scores of dollars off its resale value—but not if you “break it in” the modern way with amazing new Graf-ex! Here’s a new lubricant discovery that defies even the blasting heat and metal-warping speed of 1934 motors! Instead it takes any motor—new motors especially—and builds into cylinders, bearings and valves an amazing self- lubricating quality. It checks the danger of “freezing” pis- tons; fights scoring and scuffing of new cylinder walls and breaks in the car with an utterly new smoothness and better preserved compression. Less need for “‘tightening up” after the first few thousand miles. As the motor runs, Graf-ex puts a glass-smooth finish on all bearing surfaces that means perfect compression and reduces friction drag to near the vanishing point. : | THREE MILLION MOTORISTS AGENTS! ARE LOOKING FOR YOU! Already scores of agents have found Graf-ex a gold mine —a red-hot seller to drivers of old cars, because Graf-ex, with its. high electrie-furnace graphite content, seems almost to “rebuild” worn motors. But here’s a new big market, too—the three million odd motorists who -have bought or will buy new cars in 1934. If you’re a motorist write and learn the name of the nearest Graf-ex agent; if you want to make real money witha red-hot seller, write and ask for Graf-ex’s new generous proposition that offers amazing profits, Write at once! è FAJE (RESISTING J KEEPS NEW MOTORS NEW. RESTORES PEP TO OLD ONES. 120 COFFIELD PROTECTOR CO. 198 GRAFEX BLDG. DAYTON, OHIO Thank You for Mentioning Modern Mechanix and Riding Motor Broncos to Victory (Continued from page 47) latter event, nothing happens; but if too much power pours through the rear-wheel —look out. = ` One rider, bounding up the Jackson, Michi- gan, hill lost control through having-too much power, ran off the narrow course and plowed through a soft drink stand. l EN To avoid similar accidents I carry several sprockets.: with me, which may be fitted quickly to the rear wheel. Each gives me a different gear ratio. I use one sprocket with a gear ratio of 10% to 1 on a hard-surfaced, not-too-steep hill, which calls for plenty ‘of speed. I use an 11 to 1 sprocket on an easy hill with soft covering. A third sprocket gives me a ratio of 11% to 1 which delivers power rather than speed on an unusually steep grade. i There’s little danger of a motor getting away from its rider with power on now- adays. These engines turn up 6000 r.p.m. but they cut off automatically. A spring cut- out on the handle contacts to short the motor whenever a rider leaves the seat. A leather strap fixed to his wrist pulls out the wedge. We will have many thrills—and chills— as the season progresses, but none more spine tingling than the National Championship in September. Last year I won it at Bethlehem, Pennsylvania. e> For eight years many riders tried to top this 625-foot hill but I was fortunate to be the first:over in 1928. My time was 12.5 seconds. This is a long, steep 76 percent grade; with a rock ledge 400 feet from the bottom. We must jump the ledge—or ‘else. i All championship events are run under sanction of the American Motorcycle Associ- ation. But you can have just as many thrills on neighborhood hills—if you will remember these four points: (1) Use chains. (2) Provide automatic cutout. (3) Adjust the carburetor properly. (4) Select a proper gear ratio for steeper hills. Diesel Power Brings New Speed Era (Continued from page 81) operation with speeds of over 60 m.p.b. _In this country Diesel truck-trailer trains are averaging ten miles to the gallon of fucl oil—a new record for low-cost freight, trans- portation. Stem ht he ee . A Dicsel-engined bus sped from New York to.Los Angeles in 91 hours, burning only $21.90 worth of fuel oil. A Diesel-powered racing auto finished the gruelling 500-mile Indianapolis speedway race without stop- ping once for fuel or repairs, making an aver- age speed of 86.17 m.p.h. Jt was the first car to complete the race without a stop. The new Diesel has been reduced in. size just as much as it has been increased in power. The smaller units are bringing un- heard-of economies of operation to owners of both pleasure and commercial cruisers. Inventions for August When Writing to Advertisers

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Are You Fit to Drive an Automobile? (Continued from page 59) that a field of less than 140 degrees is danger- ous for the motorist. Serious crashes await the driver who lacks depth perception. A motorist thus afflicted cannot see depth or distance. Many people are right or left eyed just as they are right or left handed, although few of them know it. To test for this failing, Dr..Lauer uses a metal instrument shaped like a flattened cone. The driver looks with both eyes through the large end while the examiner moves a pen- cil back and forth at the other end. The driver is required to focus on the pencil. If he does this to the right of a center sight on the instrument, his left eye is dominant and vice versa. j Dr. Lauer uses what is known as a “glare- ometer” to test the driver’s resistance to sun and headlight glare. The instrument consists of a light behind a circular, frosted glass and a diffusing lens. In the center of the glass is the word “out”? printed plainly on a white background which is impervious to light. As the intensity of the light is increased the probationer is required to say “out” when the word goes out to him. The Ishihara test is used for color blind- ness. This consists of a series of circular areas made up of colored dots so arranged that one numeral is read by the normal eye while another is seen by the person suffering from color blindness. Ten per cent of men and one per cent of women drivers are blind to this combination of colors. Following the examination of vision the driver’s strength of grip is tested, an impor- tant test because of the power required to hold a car in the road in case of a blowout. Staging a Championship Fight (Continued from page 51) 65,000 to 72,000 for the Carnera-Baer fight. A staff of more than 1,500 persons is re- quired at the Bowl during a mammoth show such as the heavyweight championship fight. From these are selected 150 special police- men, 450 ushers, and 150 laborers and tech- nicians. Ticket-takers and supervisors num- ber 250. Five hundred policemen from New York City Police Department are needed. Colonel John Reed Kilpatrick, president of the Madison Square Garden, said: “It is the serious problem every promoter faces in a big outdoor event, that of manag- ing the vast multitudes of varying degrees of excitement and anxiety. As I see it, the solution is in building a human barrier. “And I don’t mean one of ushers and policemen, but capacity rows up front, so there will be no vacancies to rush into. mean we’ve got to guess closely how many seats we will sell in each section and grade the first row of a lower price immediately behind the higher price. Pack ’em closer, that’s the idea.” Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers COSTS APPROPRIATIONS POLICIES FINANCING Become an Expert Accountant The Profession That Pays The demand for skilled accountants—men who really know their business—is increasing rapidly. The new national and state legislation is requiring of business—both big and small—much more in matters relating to Auditing, Cost Accounting, Business Law, Organization, Management, Finance. Men who prove their qualifications in this important field are rapidly promoted to responsible executive positions— given an opportunity to earn realsalaries, Therangeia from $3,000 to $15,000 a year —even tohigherincome-figurea. Send for Free Book— “Accountancy, the Profession that Pays” Why let the other fellow walk away with the better job, when right in your own home you can equip yourself for a splendid future in this profit- able growing profession? Preliminary knowledge of bookkeeping is un- necessary, Our free book on accountancy fully ex- plains how we train you from the ground up, or from where you now are, according to your individ- . ual needs, Low cost; easy terms. The facta about the new LaSalle training in Ac- countancy and the opportunities in this highly prof- itable field are clearly outlined in a 64-page book which LaSalle will send you free, The man in earnest to get ahead will find this coupon @ most profitable aid to progress. If you have the urge and the will to increase your income, clip and mail the coupon NOW. LaSalle Extension University The school that has trained over 1,200 C. P. A’s Dept. 8493-HR Chicago I would welcome details of the new opportunities in accounting, to- gether with copy of “Accountancy, the Profession that Pays,” without obligation, CiHigherAccountancy Other LaSalle Opportunities: LaSalle opens the way to success in : every important field of business. If in- - terested in one of the fields below, check and mail. CiBusiness Management ([Law—Degree of LL.B. OiModern Salesmanship Commercial Law OTraffic Management aye fot aia Corro- ORailway Accounting Ost hy- Steno: OlIndustrial Management [ Expe] Bedieeeaiae n y OCommercial Spanish Oc. P. A. Coaching OEffective Speaking OBusiness English OCredit and Collection Correspondence OPractical Accounting and Office Management _ Name .... Present Position ......-.-..-.. AAEN -asia Aa 121

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Here’s an opportunity for N HOUSE-TO any wide awake man or woman to get into a busi- HOUSE ness with a big future, now in its infancy. Magic Cheese Chips are selling fast. Big, NO COSTLY MACHINE TO BUY

tasty, crispy chips—bigger a than "potato ghips, with a EXPERIENCE antalizingly delicious flavor which wins approval at the UNNECESSARY rst taste. e supply you with chips at small cost, and EXCLUSIVE the retail value is as fol- TERRITORY lows: Tremendous market avall- 10 Lbs. Chips & Bags cost you... $ 8.25 able: here are a few of the Wholesalo Value... aaan 21.00 . | Paces you may leave Magie Metall Value one 2.006260. 28.00 Beaches, park concessions, carnivals, fairs, soft drink stands, grocers, department stores, drug stores, and many others. Write for complete facts today. with chips packed according to in- slructicns. In larger quantities, chips cost low as 50c per Ib. An exceptional business whlch may be started on a small scale and built up out of profits. You can work at homo. Chips come to you already made. A few moments’ work and they’re ready for sale, Nothing complicated to do. Stores do your selling for you. You don’t invest a cent until you’ve seld yourself on the Possibilities. Then you can start with $8.25 Investment, with money back guarantee on initial purchase. Send fer infermation. Convince yourself this is an unusual business and opportunity. No super- salesmanship. No big investment. We furnish everything—display stands, advertising, ele. Get the exclusive rights for your locality. Write at once, SAMPLES FREE. FLUFF-O MFG. Co. Dept. 1665-H

St. Louis, Mo.

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CINCINNATI, O. Build ‘‘Aloha”—Trailer de Luxe (Continued from page 111) close the method of plotting this curve. Plotting should be done on a large sheet of wrapping paper to form a full size pattern. We then lay this pattern on a level floor. Strips of plywood 3%” thick, 6” wide and as long as the curves will permit are then laid over the curves of the pattern end to end. Make good butt joints where the ends meet. Cover the upper faces of these pieces with a generous coat of water-proof glue and lay on another layer of veneer or plywood. Repeat this procedure until three layers are in place. Joining Ribs and Truss Member: Mark off the points where the ribs join the truss member and with one inch brads nail the assembly together. After the glue has dried thoroughly, transfer the curves from the pattern to the rough truss thus formed and cut along the lines drawn. Short lengths of white oak cut to shape and spliced to- gether can also be used for this truss piece. The ribs are cut from plywood %” thick and 2” deep, and are cut from the same curve pattern. It will be noted that the fore and after ends of the truss terminate in curves of 9” radius. Continue the 9” arc 3” longer than is required for the truss. . The next job is the framing of the win- dows. The inside edges of the sills are cut in a straight line while the outside edges take the curve of the body. There is sufficient space between the sills to pass 14” glass freely. Our next step is to lay in the flooring. First cut strips of wood one inch square, as long as necessary, and bolt them to the angle iron joists using 4%” stove bolts for the purpose. Lay %” plywood on these joists and fit care- fully around the studs. Line the inside of the wheel wells with 24 gauge sheet metal and apply two coats of red lead. To get an apparently seamless job for the sheet metal sides of “Aloha,” the following instructions should be followed carefully. The butted joints of all metal siding which in this case is 20 gauge sheet metal are set in cement, the proportions and mixing of which is as follows. To 8 pounds glaziers putty add 1 pound dry litharge and 1 pound dry red lead. Mix this to a stiff consistency with boiled linseed oil. Do not overlap the metal in tacking it down with the smallest nails possible. Spread cement on the stud faces before tacking. Before the cement begins to set, scrape off superfluous material until the seams are smooth. Cover Roof With Mesh Wire : The entire roof is covered with %” mesh wire, shaped to the. curves of thin battens nailed ‘to the ribs. Cover the wire mesh with padding and then proceed to cut and fit the fabric top pieces which are tacked tempo- rarily in place. Chalk marks are then made where the seams occur and the whole thing then pulled off and sewed together. Replac- ing the finished fabric, it is pulled and stretched and tacked permanently after which the drip molding is tacked in place. (Continued on page 127)

Thunk You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers i

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WORLD'S GREATEST TIRE BARGAINS NEW LOW PRICES ON | GOOD YEAR, Firestone, FISK | ILL SAY $0, YORK RECONSTRUCTED } TIRES CAN’ “TAKE IT”AT ANY aS PEED /} | HEY, FELLOW / YOU'RE DOING 80! ARE THESE TIRES | IN GOOD SHAPE? Drive YORK TIRES at high speed over the roughest roads. and give more service than other reconstructed tires.” i Try a set yourself. See how the original York process of recon- istruction gives to tires the stubborn kind of toughness you ‘know you can depend upon. 18 $ years of success back of every tire we sell. Then... you have the additional protec- ition of the iron clad York | Guaranty Bond...a12 month | written guarantee of 100% , satisfa cfory service . . you x [be the sole judge. No “ifs” “ands”. No arguments. Don't | wait. While York prices are lowest, ‘in history, get your Forder in and enjoy these su- preme values. Select either of ithe two big premiums offered jelsewhere on this page. Send fat once while this offer lasts. ORDER NOW AND SAVE MONEY U.S., Goodrich, fa | OAS... : it n Size Tires Tubes | Size Tires Tubes These tires can really ‘‘take it. 30x3, $2.25 $0.05 | 32x434 $3.35 $115 | Thousands of hard drivers aa 2:35 0.85 anan 3:45 148 | > 2X . + X. al i vouch for their unusual stam- 33x4 2:95 0.83 | 33x5 3:75 143 ina. Users say, “York Tires 34x4 825 0.85 |35x5 3195 1.55 stand more punishment HEAVY DUTY TRUCK TIRES TIRE GAUGE OR BRAND NEW TUBE | WITH EACH TWO TIRES ORDERED | BALLOON TIRES | Size Rim Tires Tubes Size Rim Tires Tubes eT ae EFI EES CUARENTE E E coe) pa te [PEIR ER TE | REALLY PROTECTS YOU E a ea ae | j Zore. 25-19 2.95 1.15 | 32x6.50-20 3.75 1.35 REGULAR CORD TIRES Size 30x5 Truck 34x5 Truck 32x6 8 ply 32x6 10 ply 36x6 Truck 34x7 Truck.... Truck... 36x8 Truck. 40x8 Truck A pi sch fous FIF L E e Gauge N at takes SSUTE E rade wall cil tire No usg No birt OR Brand Re Heavy Gau circular. mould with each two tires ordered, ed tobe | Send only $1.00 deposit with each tire ordered. ($4.00 deposit on each Truck Tire.) We ship balance C.O.D. Deduct 5 per cent if cash is sent in full with order. ALL TUBES BRAND |\NEW~GUARANTEED. Tires failing to give 12 months’ service replaced at half price. YOR K T | R E AN D R U B B E R C 3855-59 Cottage Grove ‘Avs a Dept. 4309, Chicago, Illinois

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Get Authoritative FACTS on Wild Life Like to hunt? Like to fish? Like to know what's what on the best guns, ammunition, EPA) rifles, fishing rods, reels, baits, Wj flies, outboard motors? ‘| Like to KNOW the AU- Si THORITATIVE facts on up- land game, big game, fresh and salt water fish and hun- , dreds of other things a true sportsman likes to know? Then, read OUTDOOR LIFE —the complete sportsman’s magazine—authoritative on wild life—written by sportsman writers only. 25c per copy on newsstands everywhere—regular subscription price $2.50 per year. For a limited time only we are making a special half price offer, Eight Months ) for so. w es : With Handy * 00 4 REDILITE A= ff LIGHTER FREE |] ih A sure-fire lighter. Burns naphtha, f benzine, energine, or gasoline, For pocket or watch chain. Size 1%” H : i l long — 3%” diameter. Your choice Cartridge or Shell type, - i ORDER TODAY |: You will like OUTDOOR }ġ LIFE—the alert, vigorous, f authoritative magazine for = liil sports men— first choice in ` UN smart clubs and best homes. Write N i your name in the coupon and send ) with $1.00 to OUTDOOR LITE MAGA- ZINE, MOUNT MORRIS, ILLINOIS, and h receive OUTDOOR LIFE for 8 months and Redilite Lighter FREE. Note: OUTDOOR LIFE'S regular price is $2.50 per year, or 25e per copy. This is a Special Half Price offer. Don’t miss itt OUTDOOR LIFE, 118 O. L. Bldg., Mount Morris, IIl. Send me OUTDOOR LIFE regularly every month for the next EIGHT MONTHS. Enclosed find $1.00. Also send me ENTIRELY FREE (Mark which one you want) € ) Cartridge Lighter € ) Shell Lighter Carnival Racketeers Fleece the Public (Continued from page 73) Regardless of the type of bottom, the buckets are all operated in a similar manner. The turn of a screw in the.control room acts upon movable ball bearings in the central leg of the tripod supporting the bucket. This central leg is hollow. As the ball bearings are forced upward by the pressure of the screw, they in turn act upon a rod or spring which raises or lowers the bottom of the bucket, or exerts an upward pressure on the tautening ring as the case may be. Secrets of the “Bottle” Game The human desire to knock balanced things over, the “chip on the shoulder” com- plex, is capitalized upon in the “milk bottle pyramid” game. But even though stakes are small in this game, the owners aren’t taking any chances. The wooden milk bottles are arranged in a pyramid of 3, 2 and 1. All the bottles, however, are not made entirely of wood. One is weighted at the base. If the weighted bottle is in the bottom row—where it usually is—the player is wasting both his : time and money. These games all produce a goodly revenue, but the “big time” in the carnival fleecing -business is represented by the “wheels of chance.” Two types of roulettes are used. The Percentage Wheel is the common type mounted on the “wall” of the stand. Num- bers painted on the wheel coincide with a numbered board. A pointer buzzes against the nails of the spinning roulette, indicating the winner when the wheel stops. Apparently above suspicion, the Percent- age Wheel is actually geared with a cleverly constructed mechanism which causes the wheel to repeat on a certain series of num- bers. The predetermined movement of the wheel is known to the “shields,” or carnival confederates, who play the right numbers at the right time. The G-Wheel is made of two solid parts, a framework attached to the counter by screws and a revolving steel arrow centered on a spindle which rests, in furn, on a mov- able glass base laid upon the counter. Mechanics of the G-Wheel In mounting the G-Wheel, the operator bolts the frame to boards A and C with the spindle resting on a piece of glass laid upon the center board, B. Fake nail heads make it appear that B is fastened to the same stud- ding as A and C; but in reality B is movable and is controlled by a lever. After the sporting onlookers have placed their bets on the various numbers, the opera- tor spins the arrow pointer and the graft is. on. As the arrow whirls, the operator de- presses the lever dropping the board B until the spindle no longer contacts the glass plate. The arrow now actually hangs upon the frame, still spinning, but with a friction that rapidly decreases speed. By balancing the two elements of friction and “free wheeling” against each other an experienced operator is able to stop the pointer at any number. 124 Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers

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PAYS BIG DIVIDENDS to Prospectors, Min- Sonora Prospector Located $2,000 in gold nuggets, many other re- ers, Vacationers. ports of rich finds are coming in from the gold districts daniy” new fortunes being made. EQUIP Yourself NOW---On FREE Trial Why wait? The Grubstaker will save time, money, and. gold fer you. Its simplicity of cperation, lightness, and durability make it the ideal Placer .Washer for one or two man opera- tion.. No tedicus hours of back- -breaking labor; instead, ‘sithbly’shovel placér gravel” into-hopper.with a little water. The super balance male es tho rocking jcb practically effortless; alg ehlid can do it. In a short time one can become surprisingly skiliful at making big recoveries in places where there is only a suspicion of gold. Use The GRUBSTAKER--TWO DAYS FREE Eo confident are we of the Grubstaker’s performance that we will send It on free trial upon receipt of $20.00 deposit., Commencing on tbe third day after receipt of machine, we will charge BOc per day rental against your deposit. Machine mo; be returned any time for refund of balance due you. Give the Grubstaker a trial, and zee for yourself for only a few cents. Cost of machine $20.00 f.0.b. San Francisco, Crating $1.00. Machinery from the Guggenheim Equipment Co, can alweys be traded in on new purchases. Write us regarding your minine problems. GUGGENHEIM EQUIPMENT CO., Dept. OH, 110 Sutter SL, San Francisco, Calif, THE NELSON SECTION LINER Perfect Cross Hatching. A Mod- ern Simple Device, Ne Eye Straln =—No Guess Work. Easily Operate ed—Accurate. USES PRESENT TRIANGLES. Made of LAMINATED BAKE- LITE, light weight, flexible, dur- able, your cholce—any size, any color by return mall—PREPAID U.S.A. 35e each—95c per set of three, LOLOR—Red=Green—Black—Gold- Size "1028 for10-In, —80x | Size ont for Sin, oreo Size 8x6 for 8-In,— 30160 60 ang 8-in.—45 triangle, | and 7-in. 5 elengle and 6-in: = 45 triangle. *Withont h efenuse uge for 10-in. triangle THE NELSON SECTION LI Es No. 7th Street, De Kalb, Hinols 3 A VOLUMES 2 Q SUBJECTS TEACHES—Astronomy; Chemis- try; Physics; Biology; Algebra; Geometry; Hsychology; Geogra- phy; Physiology; Ancient, Me- dieval, Modern and U.S. History; new p English; Frepeh Soapish.) Grab this chance! Educate your- self in spare time with this au- entic, accurate High School Course for home study. Frepered —_ Inotgactore- Siudy outline FREE” [POST istroctors. Study outline Money-Back Guarantee POSTPAID Courso complete posipi aid for emt: 30 RAG EE Wigconsin Complete 34,487 Magazines, To etc., ‘pay gocd prices fer 7 million photos a year! 7 of every 10 bought from INDEPENDENT, TEUR h you | to take ebe phet, ell them fants Spare dme oF full-time by into good money Beng today f for} FREE book, How to Mahig Money Yi FR E E B o oK Dept. 338, 10 W. 33 St., New York City. , a NEW scientifically prepared treatment to aid men and women banish quickly all desire for smoking, chewing or snuff. New Lasy Way. Write today for Frec Booklet. Accent no substitutes. Write camera owners. YOU can make big moncy in fobb real profits. Use ordinary camera. Turn your ERSAN A HOTOGHAPHERS. - The Health Products Company of Kansas City is now offering “FE R E E Thousands have already proved success of this HEALTH PRODUCTS CoO. - 721: Manufacturers Exch. Bidg. Kansas Clty, Mo. peoo = 4007, Profit Selling ‘STRANGE CHEMICAL ‘Increases Auto Mileage 50% By just adding a newly discovered chemical in tho gasoline in 4 car it has been-found to Increase the mileage up to 50%, cleans out earbon, adds power and pep. Used with cheapest priced gasoline to make a high powered anti-knock non-carbon forming fuel. Write today for sales proposition and trial offer. ILLINOIS MFG. LABS., Desk B, {244 N. Dearborn St., Chicago, I, ‘i. . FREE—New Blueprint Booklet—FREE Modern Mechanix Publishing Co. 529 South 7th Street Minneapolis, Minn. Thank You for Mentioning Modern Mechanix and Inventions for August Phen Writing to Advertisers H INTERNATIONAL CORRESPONDENCE SCHOOLS- “The Universal University” Box 2317-Y, Scranton, Penna, Without cost or obligation, Please send me a copy of your booklet, “Who Wins and Why,” and full particulars about the subject before which I have marked X: TECHNICAL AND INDUSTRIAL COURSES U Architect D Automobile Mechanio O Architectural Drafteman O Plumbing D Heating O Building Estimating O Air Conditioning O Wood Millworking D Sheet Metal Worker D Contractor and Builder DO Steam Engineer O Structural Draftsman D Steam Electric Engineer U Structural Engineer O Civil Engineer O Electrical Engineer O Surveying and Mapping D Electrio Lighting D Refrigeration O Welding, Electric and Gas DO R. R. Locomotives D Air Brakes O Reading Shop Blueprints DR. R. Section Foreman Oo Telegraph Engineer z R. R. Bridge and Building Foreman D O Telephone Work R. R. Signalman O Mechanical Engineer Highway Engineering D Mechanical Draftaman D Chemistry O Pharmacy O Machinist O Toolmaker D Coal Mining Engineer D Inventing and Patenting O Navigation D Boilermaker ` U Patternmaker O Textile Overseer or Supt. G D Heat Treatment of Motals DO Cotton Manufacturing D Bridge Engineer © Woolen Manufacturing ` D Bridge and Building Foreman D Agriculture O Fruit Growing O Gas Engines) Diesel Engines O Poultry Farming O Radio Aviation Engines O Marine Engineer BUSINESS TRAINING COURSES © Bueiness Management DO Business Correspondence p ž O Signs: O Ofce Management D Lettering Show Cards O Industrial Management D Stenography and Typing ‘ D Trafic Management O Civil Service 2 O Accountancy and O Mail Carrier C.P.A. Coaching O Railway Mail Clerk . O Bookkeeping O Grade School Subjects D Secretarial Work . . O High School Subjecte O Cost Accountant - D College Preparatory D Soleemanship O Advertising D Firet Year College D Service Station Salesmanship D Illustrating D Spanish O Wallpaper Decorating O Cartooning O French Salesmanship D Lumber Dealer INOM@ssccccissesecseesseaianesenchiosaseasnee devote cevasedssne ta E AEA | EE as GOTO SS ss scans ccna PE A EEE AE E AO EATE aparece = CNW iecce asian ios RANE Ales SR aiei neta States i ai S Dopisi A a If you reside in Canada, send this coupon to the Internationa Correspondence Schools Canadien, Limited, Montreal, Canada 125

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NEW FOOD SENSATION TAKES COUNTRY BY STORM Your Chance To Earn Up To $8—$20in A Day No House To House Selling No Machine To Buy Y Our present kitchen is all the factory you need to start a sen- sationally profitable new kind of home manufacturing business, already pay- ing many representatives as high as $8 to $50 in a day! No experience of any \ kind needed. Simply drop ready-prepared GOLDEN PUFF CHEESE CHIPS into a kettle and in a jiffy they expand into *% great big, crisp, crunchy, golden puffs with an indescribably delicious flavor. One taste makes everybody wild about them. Practi- cally overnight they soar to universal popu- larity in any territory. Profits simply pour in. Yet, no house to house canvassing—no ma- chines to buy—and not a penny actually in- vested until you are sure of success. Get all the facts. Mail the coupon below for full details of unique NO- RISK home-factory plan and liberal FREE SAMPLE of GOLDEN PUIF Cheese Chips. Act at once—terri- tories going fast! FREE SAMPLES GOLDEN FOOD PRODUCTS CO., Dept. L-130 Cardinal & Pine Sts. St. Louis, Missouri R ELECTRIC || =): MAIL COUPON AT ONCE H Golden Food Products Co., Dept. L-130, = Cardinal & Pine. Sts., St. Louis, Mo. : Rush me FREE SAMPLES of GOLDEN PUFF CHERSE = CHIPS and PROOF of unequaled BIG-MONEY opportunity. = m a Ei = Address = New 9” South Bend Lathe The 9” x 3’ “Workshop” Lathe is a Back- Geared, Screw Cutting Bench Lathe with automatic longitudinal feed; graduated com- pound rest; hollow headstock spindle; cuts thread 4 to 40 per in. Price with reversing Wt, 300 Ibs. motor, reversing switch and belting, complete $93. Z ‘75 less motor drive Terns $7.00 per month, Write for Circular No. 5-W SOUTH BEND LATHE WORKS ' 521 E. Madison St. South Bend, Ind. 126 Animated Gadgets Sway in Wind (Continued from page 96) the saw blade, and drill a hole for a peg to fasten the blade in the slot. Finish with outdoor enamel. paint. Make the robin’s breast and lower body red, the head, back and tail dark brown. Make the saw blade and stake white or green. The lawn goose has a laminated body consisting of a body block of 34” stock, and two wing blocks of 3” stock. The head and neck are cut out of %” stock. These parts are shown upon the squared-off pattern. Notice that the body block is cut away to receive the lower end of the neck and the saw blade support. Cut off a saw blade to a length of 10”. Saw a slot in the neck, as indicated, to receive the punched end of the blade, and drill a hole for a peg to pin the blade in the slot, as shown in the assembly . detail. Drive the other end of the blade into the body slot. After assembling, bore a 12” hole 1” deep for a dowel stick support, drive a dowel stick 12” long into the hole, and fasten it with brads. Finish the goose with white outdoor enamel. Then paint the bill and legs red, and indicate feathers and eyes with black. The crane’s body and head are cut from %” stock. The neck is a hacksaw blade 13” long, the legs are 44” dowel sticks. After cutting the body and head, and smoothing the cut edges, bore holes for the neck dowel pins, and the legs. Before as- sembling, paint the parts. Make the body, legs, neck and lower part of the head white, the bill and top of the head red. Indicate the tail feathers with black paint. Flying Thrills With Captive Plane (Continued from page 99) metal fittings are strikingly few in number and quite simple. Straight-grained spruce should be used for all important members. Minor members are made of any light straight-grained wood. Any good glider (not soarer) wing section is recommended but the curve shown in the drawings will be found satisfactory for the purpose intended. Ribs are cut solid. Built- up ribs are of course lighter and can be used if the extra work and trouble is accepted. The covering need not be high grade cloth but it should be carefully selected and doped to insure good lift. Steel tubing will be required for the axle, the axle braces and the pyramid nose brace which forms the anchorage for the ball hitch. (This hitch is only used for the single boom coupling.) aus Old motorcycle wheels can be utilized for the landing gear which is sprung with ordi- nary airplane shock cord, or strips of inner tube if the former is not accessible. Aileron and other control hinges can be picked up at the junk pile or made from large screweyes. The former plan is better and safer. : Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers

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Build “*Aloha’’—Trailer de Luxe (Continued from page 122) - The door is built up of two pieces of ply- wood %” thick and nailed and glued togeth- er.. Cut an opening 12”x15” and frame as shown in the detail. Cover the interior side with. 14” presdwood or masonite and the ex- terior with 20 gauge metal. Cellulose glass is used where curved windows occur. Installing Interior Fittings Work on the interior treatment may now be started. At this point all rough plumbing and electrical work should be installed. Automobile dome lights should be affixed to the ceiling as desired. Should the builder care to install a telephone system the April, 1934, issue of MopERN MECHANIX, page 89, illustrates a satisfactory method. ‘The job now is to install the shower and closet and wardrobe compartments. The shower pan is of sheet zinc 15” high with all joints well soldered. The interior walls of the shower are lined with masonite which laps the pan edges at least 2”. The shower valve and head may now be installed and finished up. The shower door consists of a %4%”x2” frame covered on both sides with masonite and hinged to swing in. The closet and wardrobe is formed of masonite on the ex- terior of frames only. The cabinet work is next and since it already has a floor we build up the frames using %”x1%” stock. All cupboard doors are of'%4” plywood. The countershelf top is of %” plywood covered with zinc. The sink is formed of this same material using care to sée that all joints are well soldered and par- ticularly the drain connection which leads to spill on the ground. The refrigerator is insulated with two layers of %” celotex on the sides and four layers on the bottom. Cover sides and bottom with 26 gauge gal- vanized sheet metal. Provide the ice pan with a drain. . Details of the Gas Tank It will be noted on the Longitudinal Sec- tion that there is an oil or gas tank located back of the water tanks. This is a standard automobile gas tank. Pipes for filling the tanks should run to the exterior of the cabin walls. Cover the ends with radiator caps. The type fuel used for the stove will depend on the builder’s choice. Water pressure is secured by the method described in the Sep- tember, 1933, issue of MODERN MECHANIX, page 96, by which the use of a hand operated tire pump forces air into the tanks, causing the water and fuel to run freely through the taps. "" * Blueline prints of Aloha, printed on tough |, white paper to stand rough handling in the -,workshop, are available at $2.00 postpaid. These prints contain both installments of the plans enlarged several times. Address orders to Modern Mechanix Publishing Co., 529 So. ‘Seventh Street, Minneapolis, Minn. Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers NOW FIX ANY MAKE OF BOOKS ^11 saerep FREE. - on approval; whether you want to qualify as ‘garage owner, auto re- pair expert or merely wish to know how to keep your own car 100% efficient, look at these books—they are sent to you for free examina- tion. This brand mew edition has been prepared by a large group of America’s greatest automotive engi- neers. Anybody who can read will understand them, for this great auto- moblle encyclopedia is a veritable gold mine of valuable facts. Take advantage of this offer now; send in the Coupon for FREE examination. You don’t pay us a penny, you don’t obligate yourself to pay anything unless you decide to keep the books. Just tell us you want to see them and the full set of 6 great Yol- umes, just off the press, will be sent to youl Read them, look them over and prove to your own satisfaction that one fact alone, which you will find in them, may. save you an expensive repair, or help you to a better job. Very Latest Edition Imagine books which aro so new that every page is right up to dale— wiring diagrams, construction detalls, service problems—are all right up to the minute. Nowhere else can you get 2s complete and up-to-date information, Over a million dollars of resources have enabled us to give you the most authoritative books on the subject ever published. Everybody interested in automobiles in any way will welcome these books published by the world’s largest publishers cf Technical Cyclo- pedias (est. 1897) with agencies all over the world. Can You Fix It? Can you take out “play’’ in differ- ential? Can you kill the ‘‘shimmy’ in steering? Can you reset ‘TIM- ING? Can you put your finger on engine trouble without guessing or tinkering? Can you pull the starter off and fix it? Can you adjust and repair transmission, engine, rear axle, bearings? These Books Tell How und tell you hew to do any and every auto job right, the first time. 6 Big Volumes Nearly 3,000 pages, over 2,000 illustrations, wiring diagrams, equip- ment charts, etc. De Luxe edition with gold-stamped flexible binding. Sent FREE for 10 days’ use. If not wanted return express collect. If kept, send only $2.00 after 10 days, them $3.00 a menth until speclal advertising price, $24.80, is paid. A Year’s Consulting Membership FREE ! Privilego of ccnsulting engineers of millicn-dellar American Techni- tal Society on any autcmetive problem for one year without charge. If yeu mall coupen immediately we will include, free, extra volume 7 with ecmplete infcrmation on 1934 cars, knee action wheels, etc. Aviation Motors ` Knee Action Wheels IR. Rear Engine Cars Outboard Motors x Octane Selectors Tractors All Fully Covered Wet Do Gua pan SENDANO MONEY B American Technical Society, Dent, AC-320 na m Drexel Ave. at 58th St., Chicago, Iinols, : I woul] like to see the brand new 6-volume cditicn of your automo-. bile books but without any obligation to buy. I will pay the few cents delivery charges only and will examine the books andreturn iE them at your expense in 10 days unless I like them, in which case I wili send you $2.00 then and only $3.00 per month until §. i the special price of only $24.80 is paid. You are to include free, consulting membership certificate in the American Technical E E Society. Send latest edition and also include volume 7 Free. ry Witlamasicrieics secanecs 1350s a0 8 vlna onc AEAT | Street a City... Employer’s Name....... sc cece cece eset etre en reece r teenies ~F Employer’s Address.........---04. E EE E EA E i | | The coupon must be filled out in full. If not employed ft write us a letter explaining your work. Ven m mamma m m mm m m m m m se al 127

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We didn't “Forget” Anything when we made this ‘19 Price on the ATLAS 9” Screw Cutting Lathe You buy a complete unit, NEN ATLAS ready to run, with self-con- PRESSES tained countershaft and all nied belts. Built in four sizes, for all Standard equipment in- classes of work, | cludes automatic reversible Bench and Floor | feed; hollow headstock spin- Models. More | dle; complete set of gears to and bigger bear- | cut from 4 to 72 threads per ings. Special | inch; thread cutting dial; Atlas construc- | Compound rest graduated to tion prevents 18073 six speeds With pat- A : ented compoun evice, oing away side play in quill. | with complicated back gears; Vee- Speeds up to 5200 | belt drive—more pulling power. R.P.M. Precision tools — Priced Forty-five parts of Zamak Metal which has twice the strength of east iron but is much lighter, thus doing away with useless weight. Lathe bed of heavily ribbed cast iron accurately machined and ground on very latest type of ma- chine shop precision equipment— tested before shipment to .001” ac- curacy—9" swing—18”’ to 36” be- tween centers, Immediate shipment. 10 days’ trial with money back guar- antee. Full line of tools and attach- ments at lowest prices. Send for -free illustrated catalog. Be sure you know about the Atlas Fully Equipped Lathe before you order. ATLAS PRESS COMPANY 1852 N. Pitcher St. Kalamazoo, Mich., U. S. A. from $13.95 to $33.45 for he BIG PAY J AVIATION, LINCOLN-Trained pilots and mechanics are in line for higher pay positions becouse they are qualified. Our Government-Licensed in- structors Know how to train you for the big pay jobs in aviation. Fly All Types of Planes—high and low wing monoplanes, biplanes, open cockpit and cabin sind ine ships. You learn straight fring, blind flying by instruments, cross country, sleds landing, ‘aerial navigation, acrobatics, ins ding Ma Mastor Mechanics Course. World’a School. Government Approved. ay € Opportunities i in Central and South America as well as in U. 3- Aviation taught i ia start training Fe Sat Tina tnit Hyice"Sensels for ono of these e, irplane Lu choo! 406¢ Aircraft Bide., (piang E Nebr= * Jobs, 128 New Jobs Government spending mil- lions of dollars, promoting com- mercial aviation in a way that will mean thou- sands of new jobs. Now is the time for you to Camper Kinks for Auto Tourists (Continued from page 88) three days’ supply of staple groceries, well assorted. Long straps always come in handy when tieing down the luggage. | They can easily be cut out from the “furry” flaps used inside some auto tires. Buckles can be bought at any hardware store, and sewed in place. High-top hiking boots are quite a nuisance to get into and out of. To avoid the need for withdrawing the lace from the lower eyelets, cut rubber laces from an old tube. The air mattresses used by many campers are not at all easy to inflate with an air pump. Before camping for the night, stop. at a filling station and over-inflate the spare tire. In camp just attach a rubber tube to: the spare tire, using special fittings obtain- able at auto supply stores, to inflate the mat- tress. A good tire can be inflated to double pressure without danger. To warm up the tent on chilly days fill a pail with round stones about the size of eggs. Cover with water and bring to a boil. Pour off the water and place the pail of hot stones in the tent. They will radiate com- forting warmth for several hours, My Flight Into the Stratosphere (Continued from page 36) and safe as any flying. Of course, much greater speed can be attained—and therein lies the reason for stratosphere planes. The reduced density of the air will allow the “stratoplane” to travel three times faster than at ordinary altitudes. Sealed in an airtight dowmetal ball at- tached to a hydrogen-filled balloon, my wife and I intend to invade the stratosphere this summer, taking off from a point somewhere near Detroit. We will take our own breath- ing air with us. Our balloon is built to attain an altitude of about eleven miles. Our main interest is the study of cosmic rays. What are they? I really don’t know ex- actly. Who of you readers knows exactly what light is? It is “electromagnetic waves,” you may answer. Yes, that is right, but who can say exactly what that means? Why does one need to go so high to study cosmic rays? It is true that these rays come down to the earth and that we can observe them here. Nevertheless, what one may ob- serve about them near the ground is very little compared with the wealth of knowledge we hope to gain by observing them ten to twelve miles up. As a matter of fact, scientists discovered cosmic rays near the ground. But they did not call them “cosmic” rays at that time. They believed the rays came from the earth. and were given off by the minute quantities of radium dispersed in the earth’s mass. Then it occurred to some scientists that if cosmic rays came from the ground there (Continued on page 130) Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers

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High School 2 Years 7 You can complete our sim- plified High School Course 46 home in 2 years. Meets all requirements for college entrance, business anc: the professions, Standard High School texts supplied. Diploma awarded, Separate Ai. subjects of desired. | 20 Other Over 200 noted Engineers, Business Men, and Educa- tors, helped prepare the specin), instruction which you k need the well-paid positions in —Business —Archi- ourses Pectare, automotive Drafting —Hlecizteal Me- chanical .——Steam_—Civil before —Law. Chee! 4 course that interests you; mail TODAY for Free Bulletin. Ne olinsin ‘American School, Dept. HC28, Drexel at 58th, Chicago FY Success! SG DON'T COPY - LEARN TO ORIGINATE! RAYE BURNS will teach you HOW to CREATE ORIGINAL CARTOONS at home that you can 85 BEIL! Course has 26 lessons and 600 illussragions. name and address for free details. ly. RAYE BURNS SCHOOL, Dept. F-X Box ii CLEVELAND, OHIO z and FALLING HAIR Don't continue to endure itching dandruff and falling hair. Have a clean, healthy scalp. Give your hair a chance to Brow, - No matter how stubborn your case is, no matter what else you've ‘tried, if you want QUICK RESULTS, send today for DANTUM; “Try it at our riskl SEND NO MONEY Just send your name and address, and we'll send your DANTUM treatment by return mail, C.O.D. for $1.00 plus postage. Or, enclose DOLLAR BILL with your letter, and we ship postpaid. Sour money-back if RANTUM fails! DANTU PROBUCTS 739 N. Troy St., CHICAGO 5 t8 Mystery Cigar Lighter This New scientific marvel amazes everyone. LOG. JCAL SUCCESSOR TO THE FLINT LIGHTER, No fiint---no friction---a brand new ignition principle. Every demonatrationesate, Sampleand money mak- ing sales plan 25c. Gold, silver or chromlum plated NO WIND CAN A DAY BLOW Opportunity " mi sample 75c. AGENTS--Get details on thie money- a) 12Lighters$2.25 maker. NEW METHOD MFG. CO. | 144" $22.50 Desk M-20 New Method Bldg. Bradford, Pa. » Sample . 25¢ Learn to Dance, Yon can learn all the modern dences=the latest Tango steps, the new Fox Trots, dreamy Waltzes, emart Collegiate Steps, and popular Society Stepa et bome. easily and quickly, New c! method makes dancing as simple as A-B-C. No muale or partner required. Don’t be a walifiower. Learn to dance.Complete course—256 pag §4 illustrations, sent cn 6 Daye’ Free Tri Equals $20.00 course. Send no money, P: v q oBtman only $1.98. plue postage upon arrival loney back if not delighted, Catalog Free. Franklin Pub. Co., 800 No. Clark St. Dept, A224, Chicago 112 BASEBALL Slang Terms Defined IO: “Instructions on How to Score;” Age, Height, Weight of Major League Play- ers;Records; Sched- ules; Nicknames of na Teams; Dimensions of Parks and Seating Capacities— all in the new edition of THE SPORTING NEWS RECORD BOOK. Vestpocket in size—96 pages—full of 50,000 baseball facts and figures. Send a Dime and Recelve Copy by Return Mail C. C. SPINK & SON, St. Louis, Mo. Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers INCHES of MUSCLE PUT ON YOUR ARMS with the GERMAN IRON SHOE MUSCLE BUILDER Here is the greatest exerciser ever made to build giant-like arms, wide, powerful shoulders, a brawny back and a tremendous chest! John Fili- pone added five inches to his arms; E. Peters added one inch to each bicep the first week! What they have done, you can do! “The Iron Shee Cannot Be Equalica”” says Wm. Raymond, America’s Strongest Armed Man Become the center of attraction wher- ever you go! Decide now that you are going to- have muscles that not only look good but are good! Get sinews of steel! The iron shoe will de- velop them to a super-state that cannot be equalled. Some of our pupils have put four inches on their biceps and increased their shoulder spread six inches. NEW MODEL NOW READY! Special new features, including the “Chain Strength Register” based on the famous European Block Sys- tem... and the “Strength Register” which registers your day by day improvement. SPECIAL FREE OFFER! The Iron Man’s Famous 60 day illustrated Picture Course of Instruction is included FREE! This is the greatest body-building offer ever presented. Ring in now for the lowest priced and biggest result-getting exer- ciser under the sun! : Send today... NOW... for FREE illus- trated information. No obligation. American Athletic Appliance Compay 4324 Paul St, Dept. MM8, Philadelphia, Pa. Gentlemen: Without obligation and without còst, send particulars about your Iron Shoe Strength Builder and Special FREE offer.

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This New) Empire -Presser sells. Rodemich says,““I made. Robinson made $397 cash profit in one month—sold 23 Monday, 13 * Tuesday, 42 Wednesday. All these statements of cash pro- fits made under solemn oath. ` WondertulNew — INVENTION Empire Electric ‘Trouser Presser Keeps pants always pressed, Puts in a knife-edge crease while you count 10. What a Whale of 8 Demonstration — does the job even while trousers are worn — that’s the secret of quick sales and the unusual earning records shown above. Made of steel, beau- tifully plated, wlth hardwood en- ameled handle, complete with G-ft. rayon cord. Looks Landing Fish With Tempting Lures (Continued from page 87) hair clipped to resemble a mouse. The writer uses this lifelike bait by casting it up on the grasses close to shore, then pulling it off, to -the surface of the water to imitate the actions of a mouse losing its footing. Most underwater lures are heavier than floating types and are used with the bait rod. The artificial helgramite and the crawfish are often effective for bass. Frog lures ‘are made in many varieties, from the rubber frog with kicking legs, to the plug type with the usual frog coloration. Any of these frog lures that have their hooks protected by weed guards, so that they may be cast into. the depths of the pads, to be pulled over the top of them, are really very deadly lures. A number of bass lures that are most deadly combine both the underwater action and the top-water feature, that is to say, when the lure is not reeled it floats on the surface, when reeled, the présence of a metal collar at its head causes it to be drawn’ under water. Those minnows in this class that come in three sections, known as hinged minnows, are most effective. Cast to some vulnerable place and permit the minnow to lie motionless on the water, just occasionally twitching it by means of the rod tip. Like the hinged minnow, the so-called pikie min- Iich. . Yeat’s guarantee. Easily carried in pocket. Over 300,000 now in use. Profitsin Advance Your profits in advance. Simply write order, Bonua given. Empire sells quickly—Average Sale made in Minutes. Newest thing out. Big repeater. Special Offer enables you to ob- FREE ~is es: Tested Sell- p A SAM PLE ing Plan absolutely free—We guar- antee you will make sales. Write for plan and exclusive territory, The Empire Electric Co.. Dept. 407 130 Cincinnati, Ohlo SUPPRESSED “KNOWLEDGE OF THE AGES ents possess? Where was the source j of knowledge that made it possible for them to perform miracles? Were these profound secrets urned with ancient libraries, or are they buried \ beneath crumbling Temple walls ? 4 These wise men of the past knew the mysteries of life, and personal power. This wisdom is not lost,—it is withheld from the mass. It is offered freely TO YOU if with an open mind, you $} wish to step out of the rut of monotonous ) existonco and MASTER YOUR LIFE. THIS FREE BOOK Man's intolerance has at times swept his achievements from the face of the earth, yet se- cret brotherhoods have preserved this sacred wisdom of the ages. The Rosicrucians, one of ; these ancient brotherhoods, INVITE YOU to ~ write and secure a free copy of the. "Wisdom of the Sages." lt will point out how you may receive age-old truths. You can learn to MAKE ` YOUR LIFE ANEW—the fulfillment of your ideals awaits you. Address: Scribe H.E. V. ROSICRUCIAN BROTHERHOOD (AMORC) CALIFORNIA ee Revs cil now is. very effective. My Flight Into the Stratosphere (Continued from page 128) should be less‘of them if one went up in a bal- loon. They tried it. To their astonishmént, ‘there were not less, but more! They went: higher and there were still more. It became apparent that the rays must come from above, from outside the earth. The Greek word “cos- mos” means “universe,” and that is why the rays were then named “cosmic” rays. They come from the universe. When you go up three miles you have passed through one-half of our atmosphere— not in distance, of course, but in mass of air. If you go up another three miles you put ome- half of the remaining air below you. That. means you will have three-quarters of the air below you and one-quarter above you. If you go further up, it is always the same story: for each three miles one ascends, one puts- half of the remaining atmosphere be- low oneself. At ten miles, one has about nine-tenths of the air below and one-tenth above. That means that the cosmic rays, if they really do come from outside our atmosphere, will have gone through ten times less air than they have passed through when we observe them at sea level. Are they, then, stronger at ten miles than they are on the ground? And how! Some of them are thirty times stronger. Others are even a hundred times stronger. Then, you ask, are there different kinds of cosmic rays? Indeed there are. That is one Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers

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My Flight Into the Stratosphere of the confusing puzzles about these rays. And how do they look, these different kinds of cosmic rays? Well, nobody aas ever seen them, and nobody ever will see them. Even the most sensitive photographic plate fails to reveal them. The only thing by which we notice their existence is the fact that they break up molecules: of air. They smash the air molecules to pieces as a rifle bullet would smash a glass ball dancing on a waterspout. What we observe, then, are the bits of broken molecules in the path of these cosmic rays. To make a long story short: these fragments of air molecules make the air electrically con- ductive, and this conductivity of air is one of the phenomena we observe when we study cosmic rays. The higher we go the greater is the conductivity of the air. l . Problems of the Cosmic Ray Cosmic rays constitute one of the most in- teresting problems of modern science. It will. take many more years to study them and many more men will have to ascend into the stratosphere before we shall really know chough about them. Then we shall (perhaps) know where they come from and what they mean. They will (perhaps) tell us, or our children, .a story of how matter is made or destroyed, high up in the cold vacancies of space, or in the blazing furnaces of the dis- tant stars. >. ‘We cannot predict what marvels we shall know then—of course not! But one thing is certain: no knowledge comes without work; and work is good; and knowledge is good. When electricity was discovered, nobody knew what it might be good for. When helium was discovered, nobody thought it might be good for anything. Now it lifts our mighty dirigibles, and allows safe navigation of.the air. History shows us that few thin s can be discovered which will not ultimately - benefit mankind. . ;. Wife to Pilot Balloon Our projected. ascension this summer will be my wife’s first venture into the strato- sphere. Why:do I take my wife with me? Simply because I need a pilot to manage the balloon while I make my observations. What better pilot could a man find than his own wife? Le What do we expect to see besides our cos- mic ray observations? We shall see the deep blue sky of the stratosphere. With ten times less air. above us, than at sea level, there will be ten times less diffused light about us, and instead. of: being light blue, the sky will be a deep purplish blue, almost black. If we can reach the stratosphere at night we shall see a magnificent spectacle. Having pierced the blurring veil of our atmosphere, we shall see the mighty pageant of the stars. The sight of the stars, alone, would be worth the whole. trip, to my mind. It is hard to say what will. be our greatest thrills on the projected flight; but I supposé‘the sight of millions of un- twinkling stars in an absolutely black night- sky, will be the greatest of them all; ` A Bigger Job— and Yow re the Man _ Are you hunting a bigger job, or does the bigger job hunt you? Why waste priceless years at routine work, when you can acquire at home jn.a compara- few months the specialized knowledge for tivel, which big firms pay big money? Thousands of men have greatly increased their incomes by the new home- study business training under the LaSalle Problem Method. Let us show you how you can do just as well or better. The coupon will Brin you complete information, together with details of our convenient payment plan; also your free copy_of a remarkable book—“Ten Years’ Promotion in One.” Make your start toward that bigger job today. M — — Find Yourself Through LaSalle !— == LaSalle Extension = 1 l University Dept. 8493-R Chicago Please send me full infor- mation regarding the course and service I have marked with an X below. Also a copy of “Ten Years’ Promo tion in One,” all without obligation to me. : 4 g Business Management: Training for Official, Mano agerial, es and Departmental Executive positions, o Modern Salesmanship: Training, for position aa Sales Executive, Salesman, Sales Coach or Trainer, Sales Promotion Manager, Manufacturers’ Agent, | Solicitor, and all positions in retail, wholesale oF | specialty selling., Higher Accountancy: Training for position as Audi- | n Fiighor Account GertiGed Public ‘Accountant, Cost Accountant, ete. Traffic Management: Training for position as Rail- | road or Industrial Traffic Manager, Expert, ja Freight Solicitor, ete. O Lew:-LL. B. Degree. Banking and Finance: Training for executive posi- | o tions in Banks and Financial Institutions, a | Oo ModernForemanship: Training for positionsinShop Management, such as that of Superintendent, Gen- eral Foreman, Foreman, Sub-Foreman, ete, (J Industrial Management: Training for positions in | Works Management, Production Control, Industrial Engineering, etc. (1 Bersonnet Management: Training in the position of | Personnel Manager, Industrial Relationa Manager, | Employment Manager, and positions relating to ~ ployee Service. ( Modern Business Correspondence: Training for Í Sales or Collection Correspondent, Sales Promotion Manager, mad a Manager, Secretary, ete. tenogra : Training In the new superior machine Oo shorthand, Stenotypy p , O Railway Accounting k a O EAE on peaking . P. A. Coaching | aer e f 4 Commercial Spanish Credit and Collection [J Stenotypy | Correspondence Ci Tetegraphy | | O Paper Salesman's Training ` Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers

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SAVES 26% GASOLINE || CARS—BUSES—TRUCKS—TRACTORS BLANCKE, famous automotive designer, licensor of General Mo- tors, Chrysler, Bendix, etc., etc., now introducing revolutionary Thermostatic Carburetion Control that tests show saves 26.6% or more Gasoline on cars. Adds pep, power, speed, acceleration— Easy Starting, prevents crank-case oil dilution and carbon formation. NOT JUST A GADGET A legitimate, clean selling device that delivers and builds repeat business. One model for all cars. BIG PROFIT OPPORTUNITY of a generation for Agents, Salesmen, Distributors. Write for Money Making Sales Plan and Trial Test Offer BLANCKE PROD. CO. Dept. D3 627 W. Lake St. CHICAGO Help Kidneys Don’t Take Drastic Drugs You have nine million tiny tubes or filters in your Kidneys which may be endangered by using drastic, irritat- ing drugs: Be careful. If poorly functioning Kidneys or Bladder make you suffer from Getting Up Nights, Leg Pains, Nervousness, Stiffness, Burning, Smarting, Acidity, Neuralgia or Rheumatic Pains, Lumbago or Loss of Vitali- ty, don’t waste a minute. Try the Doctor’s prescription called Cystex (pronounced Siss-tex). Formula in every package. Starts work in 15 minutes. Soothes and tones raw, irritated tissues. It is helping millions of sufferers and is guaranteed to fix you up to your satisfaction or money back on return of empty package. Cystex is only "5e at all druggists. AT LAST! A REAL POCKET RADIO Can actually be carried in pocket or purse! Notubes ——batieries—nothing to wear out. Simply clip to H ANYTHING made of metal for clear toned reception! One control—gets all stations 50 to 100 miles. No erial or complicated wires needed! Operates loud- peaker near statlons! Proven coast te coast reception n tests! Foolprocf—and practical—great novelty. Can be used ANYWIERE! Complete with tiny phone. Nothing else tc buy. Send only $1.00 and pay postmen $1.95 plus postage or send $2.99 (M.Q., Currency, Check). Sent p.pd., in 48hours. Complete Ins, jncluded. Guaranteed, Order now! TINYTONE RADIO Co. Dept. Kearney, Nebr. Start a Business of Your Own Or add new BIG PROFIT depart- FOR ONLY ment. Tire grooving, newest auto- 50 . motive invention. Used largest tire factories, U. S. Govt. Some make $300 month and more. Instructions Full Price. furnished. Send for it today. Nothing else to buy KWICK-KUT MFG. CO., Inc., 3810 Arsenal St., St. Louls, Me. POSTPAID "You can be “enjoying a gaoa F Electrical job in 2 years—if you will get ready for it. No man can ‘land a job until he’s fitted to do the work. Get (Bard now through homestady in spare.time. ur instruction material specially prepared b; 23 experts—noted Engineers from Westinghouse, General jectrie, Com- monwealth Edison, etc.—and well-known Educators. Complete employ- ment service included. Send for Free Bulletin TODAY Re obligation. , American School, Dept.EC28, Drexel at 58th, Chicago’ 132 RINGS $3000 PROTECTION Without Medical Examination AGES 1 to 75 YEARS American Life, one of the largest associations of its kind in America, offers exclusively this Special Copyrighted Life Certificate to anyone between 1 and 75 years. Pays up to $3,000 for Death From Any Cause. American Life has MIL-" LIONS in force to GUARAN- TEE YOUR PROTECTION. 1 BR IFE “Your Prompt Check ed My Home” ingpeciion FREE - Send No Money No obligation whatever! Just send your name, age and name of beneficiary. An American Life Cer- tificate fully made out in your name will be sent for your FREE 10-Day Inspection. NO AGENT WILL CALL. Read it carefully. If satisfied only -$1 will put your protection in force for at least 50 days; as low as 2c per day thereafter. This offer limited. Write todav. AMERICAN LIFE ASSN., Dept. F-4, Hollywood, Calif. $ LEARN TO WRITE PERSUASIVE ADVERTISING POWERFUL SALES LETTERS | Build up your own business, œœ train for a better position and business leadership by learning to write persuasive sales letters, powerful advertising, how to speak convincingly and interestingly, etc. Study at home in spare time. Low cost. Chance to earn while you learn. Write for free booklet. BUSINESS LETTER INSTITUTE 324 So. Market St. Dept. 70 Chicago HYPNOT SM Learn the Secrets of this MYSTIC POWER : Hypnotismisastrange subtlepower that gives you the key to the laner Secrets of Mind Control, When this mighty Rovere Is released, you can over- come all obstacles; make people obey your commands: strengthen your mem- ory; develop a strong. magnetic person- ality; realize your ambitione: banish fear and worry; Increase your galary; and be: come master of yourself, fri friends and ac- quaintances—either sex. These magic ee- creta are now revealed th 265-page book— “The Science of Hypnotism,’” This marvelous book explains the thtory and practice of Hypnotism; gives9 stages of Hypnotism; tells how to select subjects,how 7 hypnotize at a glance: discusses mesmerism. „magnetic : healing, mental telepathy! Most complete book published. SEND NO MONEY 22,9767 pane and ad- - dress. We'll ship book at once, Pay postman only $1.08, plus postage. Satisfaction guaranteed. Franklin Pub, Co., 800 N. Clark St., Dept. 1708, Chicago Before Buying Microscope Read These Helpful Facts How to select a microscope wisely, told in “Revealing Nature’s Wonders,” 20-page. book, sent FREE by Wollensak, world-famous lens specialists. Endless hours of exploring strange worlds, if you choose microscope well. Atus- trates and describes these models: i No. 425—Magnifies 100 to 425 diameters. .$18.50 No. 235—Magnifies 110 to 235 dlameters.. 15.50 No. 150—Maanifies 70 to 150 diameters.. 12.50 No. 100—Magnifies (00. diameters + 5.00 Slide Set—-Makes slides at home...... ooo 3.50 . , Your. dealer can show you above microscopes, or shipped by us prepaid. Or C.O.D., if you prefer. Our money-back guarantee protects you. Write for free book today—now. Buy American, WOLLENSAK OPTICAL CO. 824 Hudson Ave. Rochester, N..Y. Thank You for Mentioning Modern Mechanix.and {nzentions for August When Writing to Advertisers

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Microscope Opens New World _. (Continued from page 61) | croscopes for fingerprint investigations, bullet comparison microscopes to contrast scratches on projectiles, laboratory micro- scopes to detect blood crystals in suspicious stains, comparison microscopes to inspect forged documents, raised checks and tam- pered wills—these are but a handful of the ways in which the up-to-date sieuth har- nesses the magic eye to track down malefac- tors. ' Agriculture benefits through studies with the microscope upon soils and fertilizers, in- sect enemies, plant anatomy, better varieties of plant staples, cotton, wool and honey, purer milk. Mineralogists analyze crystal structure and compile important generaliza- tions as to the structure of gold, silver and other ore. For those who enjoy hobbies and experiments even the simplest microscope unfolds a mysterious unseen world before his very eyes. In a single drop of water alone there is an awe-inspiring panorama of life, not known to the average person. That is the reason microscopy daily be- comes more popular. It is a hobby that need not be highly complicated, expensive, or overly technical with scientific data. It is me of the most absorbing pastimes you can ind. A NEW M-M FEATURE! The entertaining things you can do with a microscope will be covered in a series. How to select a microscope, in case you do not already own one; how to operate this simple yet amazing instrument; things to make and | things to do; be sure to follow this series and take part in the highly instructive and inter- esting program in store for you. “Life in Ice” Prize Contest (Continued from page 66) above pictures were faked by special pho- tographic processes? Give your reasons in 250 words or less, and be eligible for the other $25 in prizes, divided as above. Judges will base their decisions on clear- ness of reasoning, originality of ideas, and neatness, rather than scientific accuracy. Contestants must give age, occupation, and education, though this information will not be considered in awarding prizes. Your entry should be postmarked before July 25, 1934. Decisions of judges will be final, and no entries returned. In case of ties, duplicate prizes will be awarded. Winning letters will appear in the October issue. Employees of this magazine or their rela- tives are not eligible to compete. You don’t have to buy a copy or be a subscriber to enter. Address M-M Contest Editor, 529 So. 7th St., Minneapolis, Minn. Prize winners of the June contest are an- nounced on page 142. Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers 440 page book, $7.50, fully illus- trated, free with each Model R. MODEL R MICROSCOPE WRITE FOR COMPLETE DETAILS Here is the newest microscope produced by Bausch & Lomb, whose professional microscopes are used by scientific institutions all over the world. Produced in the same factory, by the same skilled experts, Model R shows finest details of any specimen with clarity and sharpness. Modeled after newest labora- tory types. Rack-and-pinion focusing of exceptional smoothness. Concave mirror yields superior illumi» nation. Can be used for photomicrography and projection. Solid Walnut carrying case, $7.50 book and Model R, complete for $21.00, at dealers or direct if no dealer near you. Write for literature. Below—Gem Science Kit, complete home laboratory for mounting specimens perma- nently. Includes 49 pieces—-stains, clearers, petri dishes, etc. Without microscope, $9.50. Right— Photomi- crographic Outfit. Takes Photos throush micro- Scope as cany as snapshots. Fita gg any microscope, $12.00, I 763 St. Paul St., Rochester, N. Y. ] Please send literature on complete microscope I equipment. Free. i | Name eects caciceDckeneiate neat enniaen j y J Address cohen teins deren se eee 133

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ICAL e ee NOs ELECT A-C-RADIO TELEVISION EVERY ELECTRICAL SUBJECT COVERED Here’s great news for. anybody interested in Electricity. BRAND NEW edition. of Applied Electricity brought right down to date with every NEW Electrical subject fully covered. 10 big Volumes and all shipped FREE for examination. RA BIG FIELD! Big Demand! . Men who understand electricity 5 Big Pay! are urgently needed righl now in thousands of industries. Autos, oirplanes, machine shops— practically every industry deperda on electricity and men who know this subject mni © blig money, Pleasant, fascinating work, easy'to lenrn and do; learn qelctly with these books. Send coupon . for a set for F] For Beginners an Experts Over. 30.0.0 "iomart pageo— hundreds. ever published. Dynamos, motors, power stationa, * radios, televiulon, everything elec- trical explained clearly ao anyone can understand A year's consulting membership In.the American Technical So- ciety now given free to all read- era of this famous Cyclopedia of Electricity. Many eay,*‘That’s ‘worth more than cost of books."’ AMERICAN TECHNICAL SOCIETY Dept. EC320, Drexel at-58th St. Chicago — — e ee e American Technical Society, Dept. EC320, Drexel at 58th St., Chicago Send [or 10 days’ free use, BRAND NEW 10 volume set of Electrical Engineering. n return for mailing this coupon promptly, send free, certificate of membership in the American Technical Soclety entitling me to full consulting privilege for - 1 will pay the few cents delivery charges on the books, If I wish I return them in 10 days and owe you nothing, but if I keep them Iwillcend $2.00 after 10 days, then $3.00 a month until the special price of only $29.80 is pald. Olty =a Agee eos, State._______---.-. Attach letter stating age, occupation and name and address of employer and at least one business man as reference. Write for free booklet describing ‘87 Plans for Operating a Successful Business of Your Own”. Make from $20 to $100 a week starting in spare time at home. No peddling or house-to-house selling. Booklet sent free, and without obligation. Write for your copy today. ELITE PUBLISHING CO. Dept. G 214 Grand St. New York, N. Y. WITH THIS AMAZING INSTRUMENT ANYONE CAN FIND BURIED TREASURE! Tt is light, compact, and extremely easy to operate. One of the greatest inventions of the agel No skill or calculations required. WORTH ITS WEIGIIT IN GOLD TO THE PROSPECTOR. . Can be used lo show LOCATION and DEPTH of lost pipes, cables, casings, ete, : UNTOLD MILLIONS in Gold Bullion, Coin, Silver and Rich Ore lie buried, ready for easy. discovery with the Mectallaseope. FIND THAT BURIED TREASURE BEFORE SOME ONE ELSE DOES. i Absolutely guaranteed able to detect buried --gold, silver, copper and other metals. n Write for interesting free information, METALLASCOPE SALES 1040 South Broadway Dept.. M 134 co. Les Angeles, Callf. EE examination and see for yourself. + Radio Hunters to Seek Pirate Gold (Continued from page 54) metals is determined, samples are obtained by an ordinary mineral drill. Digging opera- tions follow if the sample is promising. Skeptics profess to believe that the treasure of Cocos Island is non-existent, pointing to the failures of innumerable gold-seekers as proof of their contention. There is a reason for these failures. Cocos Island is a green, treacherous land, hostile to invaders.. Its precipitous cliffs are almost hidden under masses of tangled foliage. The inland shrub- bery is so thick that even the wild pigs find parts of the island impassable. The terrain is rugged, strewn with boulders and pock- marked with pits and treacherous gullies. There is scarcely a level spot on the island— only in two or three places is it possible to pitch a tent. i : Story of the Cocos Treasure But the treasure is there and its story is one of the most remarkable sagas of buried gold in the history of the world. Legend has it that the Incas started the treasure ball roll- ing by sailing to Cocos Island 400 years ago, laden with gold and precious ornaments to escape the cruelties of the Spanish conquer- ors. This account, of course, lacks authen- ticity; but later records prove that the Cocos treasure is not a myth. ae The real story-of Cocos Island begins some 250 years ago, in the days of Captain Edward Davis, as swashbuckling a pirate as ever sailed the Spanish Main. Following a series of successful forays in the Caribbean, Davis and his men swept around the Horn and up the west coast of South America, looking for fresh plunder. Spanish ships and garrisons fell before his ruthless onslaughts, each yield- ing up a store of gold and silver. : With the hold of his vessel filed: with Spanish treasure, Davis sailed north to Cocos Island. Here he beached his ship, scraped the barnacles from her bottom and buried his booty. Putting to sea again he resumed his raids and as his treasure grew, he re- turned again and again to Cocos. On onè of these trips alone, a chronicler of the times reports that Captain Davis buried “Three hundred thousand pounds’ weight in silver dollars, seven hundred and thirty-three bars of gold; also seven kegs of gold coins.” Stronghold of the Buccaneers But Captain Davis was not the only one to seek sanctuary for his plunder on Cocos Jsland. The rocky stronghold was a favorite resort for innumerable buccaneers -who could not return to civilization with their bloody gold while the hands of the outraged nations were lifted against them. In conse- quence, they buried their loot on Cocos, hop- ing to return at some later date and retrieve it. But their high hopes were doomed: Many of them lived only to swing from a yardarm or a hangman’s. gibbet and their treasure -still lies on Cocos, buried perhaps forever. ~The records of these swashbuckling days are necessarily hazy but definite proof of the existence on Cocos of still other pirate gold Thank You Jor Mentioning Modern Mechanix and Inventions jor August When Writing to Advertisers

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Radio Hunters to Seek Pirate Gold is found in the history of the notorious free- booter known as Bonito of the Bloody Sword. History had moved on a hundred years since the days of Captain Davis when Bonito hoist- ed the Jolly Reger to his. main truck and began to carve out a sinister career for him- self with his thirsty sword. Utterly ruthless, Bonito was the scourge of the Pacific. He swept the coast like a plague, leaving a trail of sunken galleons and burning towns in his wake. And with the taking of each new prize, he sailed for Cocos to secrete his booty. The Golden Treasure of Lima _About the same time that Bonito was de- positing his plunder in the Cocos safety vaults, thrilling events were transpiring on the mainland. Bolivar the Liberator, a sol- dier-statesman who was to free what is now Venezuela, Colombia, Ecuador, Panama, Bo- livia and Peru from Spanish rule, was sweep- ing down on Lima, capital of Peru, Spain’s treasure stronghold in the New World. Ter- rified, the Spanish aristocrats prepared to flee. Loading a twelve million dollar cargo aboard the Mary Dear, an English brig com- manded by a Captain Thompson, they sailed ` from Callao, Lima’s seaport, bound, as they thought, for Cape Horn and the ultimate safety of Spanish waters. But Thompson was not proof against the lure of his golden cargo. Once clear of Callao, he slew the Spanish refugees and set a course for Cocos Island where he buried his plunder. Cocos Island itself is the chief goal of the modern gold seekers; but the pirate territory surrounding it is virtually teeming with treas- ure trove. No one knows what vast amounts of gold and silver lie buried, fathoms deep, in the hulks of sunken galleons driven on the jagged reefs by coastal hurricanes or blasted into the deeps by the fire of pirate guns. Where Pirate Gold Still Lies Panama City, for example, still holds the secret of a vast store of plate, jewels and bullion buried when Sir Henry Morgan raid- ed the town in 1671. The tiny island of Trinidad, in the South Atlantic, off Brazil, still guards a secret pirate hoard. The islands of the old Spanish Main (now the West In- dies) are fertile hunting grounds for modern treasure seekers. Haiti, Tortuga, Cuba, Ja- maica and St. Kitts—each has its stories of pirate gold, guarded by the ghosts of ancient buccaneers. Stevenson’s dream of “Treasure Island” is coming true. Recently a find of $45,000,000 in Peruvian gold ingots was reported in the Tuamotu archipelago, east of Tahiti. Modern machinery and scientific apparatus is being rushed to the spot. A coffer dam is to be con- structed to recover the gold which lies in eighteen feet of water. All over the world men are arming themselves with twentieth century weapons to answer the call of treas- ure trove. Science has taken up the ancient pirate challenge. Treasure hunting is big business now. Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers TYPEWRITER | (Nen REMINGTON] | ou. PORTABLE i TEN | ADAY TRIAL | Only 10c a day buys this latest model { machine. Not a used or rebuilt type- J writer. A beautiful brand new regulation | Remington Portable. Standard keyboard. i Carrying case included free. Try it in your | home or office for 10 days. If you do not | agree that it is the finest Portable at any | Š price, return it at our expense. Don't | delay. ` [| FREE TYPEWRITER COURSE | Å b Mall Coupon Today or Use Post Card eee ee ee i 1 REMINGTON RAND INC., l I DEPT. 2806, BUFFALO, N. Y. i 1 Please tell me how I can buy new Rem- J 1 ington pottable typewriter for only 10c a I I day. Also enclose your new catalogue. l l Namen ennaa ae a nA l Address onem me E N H L i For Economy BUY—For Income SELL The EIFEL- GEARED PLERENCH KIT NEW 7° and 614° Sizes— mou : Each with 3 instantly ae Jaw: A A $50 Service at the Cost of One Tool ‘ S @ MAIL this Ad Today with your addres Get FREE—7-Edge End-&-Angle Screwdriver; 101 Picture Manual of Mechanics, with (User Offer, or C Distributor Territory and Free Kit Ofer. A Bea PlieRench Man, They're making $35 to $125 Weekly! x AMERICAN PuERENCH CORP'N MMH-4009 N. Ashland Ava. housands Of INVENTIONS WANTED 25c yearly by manufacturers—Patented or Unpatented. Our large list of invention buyers and necded inventions sent for only 25c coin. Write today—Delays may cost you a fortune. z ALBERS RESEARCH LAG. 3634 Humphrey St., St. Louis. Mo. Are you adult, alert, ambitious, willing to study? Investigate LAW! We guide you step by step— furnish all texts, including 14-volume Law Libra- ry. Training prepared by leading law professors and given by members of bar. Degree of LL. B. conferred. Low cost, easy terms. Send NOW for Free ,64-page“Law Training for Leadership.” LaSalle Extension University, Dept. 8499-1 Chicago 135

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Throw Away Your Aerial! Amazing $1 Device Does Away With it ENTIRELY 1 Special Tuning Feature Improves Selectivity, Tone IMPLY hook Walco Aerial Eliminator on back of radio— forget yards and yards of aerial trouble! Size only 3 x 5 inches. Eliminates ugly wires all over room, on roof, or hanging out window. Gives volume and distance equal to out-door aerial with far BETTER SELECTIVITY. NO MORE NUISANCE OB DANGER Easy to connect Walco Aerial Elim- inator in 2 minutes without tools! Ends all dangers of lightning, storms, short circuits. No more clicks and noise from wind and rain. NOW you can hook up radio in any room. No wires show. SEND NO MONEY Try It 5 Days at Our Risk ! Merely mail the coupon. No money neces- sary now. When delivered pay postman $1, plus few cents postage. If not delighted, relurn it in 5 days—your $1 refunded at once. i ELECTRICAL LABORATORIES CO. 141 East 25th Street Dept. 308 New York Clty ELECTRICAL LABORATORIES CO., Dept. 308, 141 East 25th Street, New York City Send Walco Aerial Eliminalor, with instructions. WHI] pay postman $1, plus few cents postage. If not delighted, will return in 5 days for $1 refund. l DYNAMIC Address ....... te eeeees ten eeees COED ee ee ree eee oO Check here if ENCLOSING $1—thus saving postage charges. Same refund Guarantee applies. DEALERS—Write for proposition BUILD YOUR OWN TELESCOPE Same type as 100” Mt. Wilson Telescope. No experience or special tools needed. We furnish complete set of in- structions and all necessary materials at lowest prices. Send 10c for catalog including complete -~ instructions for building your telescope PRECISION OPTICAL CO., 99! E. 163d St, NEW YORK for MORE PAY Learn From RAFTING ~. Trained Men Needed NOW! NEER GET READY FOR PROSPERITY. Be teady for Big Pay. I will train you at home by mail on Practical Drafting until in position, or prepare you for Better Pay on the Job you have. All high class tools with Drawing Table’ furnished by me if I train you NOW. NO EXTRA CHARGE. Write jor my free book—My Pay-Raising Plan. FREE Employment Service : wun After training you I help you to get a job without charging extra for this service. Emp oy- ers know that Dobe Trained Men make good as they have learned drafting by actually doing the work, in a practical way. Age or Lack of Education No Drawback. Previous ex- perience is not necessary. You do not need to be a. college or a high school graduate. Find out from me what a big oppor- tunity ‘there is in practically all industries for Draftsmen. ; ining’ i afte: Mon ey B a ck If my training does not satisfy you r : you finish—you get every penny back. Wi Sta Tns Send a Postcard or Letter with your 7 Trite Today. ? Name, Address and Age for my ‘Better Pay Training offer “FREE” without obligations to you. ENGINEER DOBE, Div. C473, Libertyville, II. 136 COMPLETE ELECTRIC PLANTS ONAN A.C. PLANTS furnish same current as city service. Operates Radio, Water System and Household Appliances. $ SIZES 300 WATTS UP . Models low as $99. No battery used. Easy to install. Ideal for farms, lake homes, commercial purposes. À D. W. ONAN & SONS 852 Royalston Ave. Minneapolis, Minn. 250 Money Making Ideas. Only 35c Postpaid All guaranteed to be money-makers, proven and successful in actual use. Many from U. S. Government records. Many new and unusual. A storehouse of whole and spare time opportunities for both men and women. (Not mail order plans.) Send either coin or stamps. ENTERPRISE BUREAU TOWER M-M SYRACUSE, N. Y. FOLLOW THIS MAN Secret Service Operator No, 88-Ja on the i! Runalng down dangerous Counte: Gang. Tal- tale finger prints in murdered gi: ial Report Free Operator . J8 mace to his chi Write for é. $3000 a year and up . YOU can become a Finger Print Expert athome, in your spare time, at small cost. rite for con- fidential fal] report and detalls, Literature will NOT be sent to boya under 17 years of ace. INSTITUTE OF APPLIED:SCIENCE 4920 Sunnyside Av ~T@RAISERABBITSFORUS We Supply Stock and Buy What You Raise PAYING YOU HIGHEST PRICES— Established 20 Years. Big Profits in Chinchillas, New Zealand Whites, ete. Easy to start. Big rabbit book catalog and monthly market bulletin showing prices we pay our breederssentfor only 10e. Address OUTDOOR ENTERPRISE CO., ino. NEW CITY, Rockland County, N. Y. room, BOAT AND CANOE SUPPLIES Send today for our catalog of Boat and Canoe Supplies, enclose 10c to cover mailing and handling. ARMSTRONG & GALBRAITH Inc. H 79 BARCLAY ST. New York City DESIR D’AMOUR (LOVE’S DESIRE) —tThe irresistible perfume— An enchanting exotic perfume of irre- sistible charm, clinging for hours lke lovers loath to part. Just a tiny drop is enough. Full size bottle 98c prepaid or $1.32 C. O. D.- Directions free. One bottle FREE if two are ordered. FRENCH ROY ToAny Suit! Double the life of your E. coat and vest with correctly matched pants. 100,000 patterns.“ Every pair hand tailored to your measure, Our match sent FREE for your O, K. before pants are made, Fit guaranteed. Send piece of cloth or vest today. $3 SUPERIOR MATCH PANTS COMPANY 209 So. State St. Dept. 137 o! Chicago AKE MONEY” At Home! ARN steady income each week, working at home; coloring photos and miniatures in oil. Learn famous . “Koehne Method” in few weeks. Work done by this method in big demand. No experlence nor art talent Deeded. Many become independent this way. Send for Irec booklet, ‘‘Make Money at Home.” NATIONAL ART SCHOOL, inc. 3601 Michigan Avenue, Dept. 205-C, Chicago, illinols Thank You jor Mentioning- Modern Mechanix and Inventions for August Phen Writing to Advertisers

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: in Own cies: Why work for others when you can become independent in a highly Profitable business of your own? Many are earning quick, easy profits cleaning carpets and rugs, like new, on customers’ floors. Electricity does the work. No shop necessdry. Cus- tomers REPEAT regularly. BACKED BY $58,000,000 CONCERN F. E. Bonner writes, “Made $70 in 13 hours.” L. A. Eagles took in $200 first week, Harry Hill writes, “Pald | for home with H-B Rug-Washor—earned $86 first day.” C. R. Bergseth writes, “My profits run about $400 every month.’’ Big profits at Prices lower than other methods, Every home, office or institution is a logi- cal customer. A proven business with a steady demand for your service. EASY TERMS Free illustrated book- let explains payment plan and tells how you can become prosperous in a permanent, year-around business. Send for it TODAY, H-B CO., 6256 H-B Bldg. Racine, Wis. TRICKS WITH 110 VOLTS Electric Fun! Make toy motors, buzzers, tops, machine guns, arcs, shockers, lights obedient to the voice, window novelties, floating rings, spirit rapping—all kinds of amusing and practi- cal electrical devices. Our book gives full direc- ‘tions for doing 200 stunts with 110 volts, A.C. Price postpaid $1.00. CUTTING & SONS 84-D St. Profits Pay for: Home CAMPBELL, CALIF. Get Your Own Patents |= Pay only government fees. Legal blanks and book with complete instructions, postpaid $1. LEARN TO ot Ba LEARN the LEAD Al FOLI LENA TA AT H o M E correct OTTON Brees “AY f This new, simple method teaches you QUICK- LY AND EASILY. 24 DIFFERENT STEPS TOR ALL MODERN DANCES. The mod- ern FOX TROT. The dreamy WALTZ. LATEST TANGO, The latest SOCIETY STEPS will make you HAPPIER, HEALTHI- $ ER, MORE POPULAR. YOU'LL 9 ENJOY DANCING. Money back if not satisfled after 10 days’ trial, GET SOME ENJOYMENT OUT OF LIFE! Write for full particulars, without obligation, to IRVING SCOLNICK 147 West 42nd St. New York Men's Aviation Loaguo by sending mo “two bits" (25c), today for my now 1934 Aviation wpe ely catalogue and IT give you one of these beautiful Pifel's tape! pine abishuely ros of chargo white they lett. You win twice Kecavie tho catalogue wil save you many, many dollars on your purchases. 632 W. Poplar St. KARL ORT York, Pa. OUT OF THE WAY «sess Simple attachment, easily installed, does away with the inconvenience of the gear shift lever. Gives more leg room. Makes the front seat as roomy as the rear seat. Enables 4 3 to ride in comfort. A necessity in any car. Send $2.00 for yours now. (Also sent C.O.D.) Satisfaction guaranteed. Full particulars on request. S. L Dept. A HJERMSTAD CO. Wallace, South Dakota Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers BECOME A RADIO EXPERT cas GOOD JOBS Learn Radio-Television Electricity & Talking Pictures in Los Angeles A GOOD JOB AWAITS YOU IF YOU TRAIN IMMEDIATELY National will quickly train you to qualify for good jobs in all branches of radio, television, talking pictures, broadcasting, operating and general electricity. Thorough practical training. Over $100,000 in modern equipment. Complete broadcasting and television studios where you get actual practice in all branches ‘of these interesting Temunorative trades. GRADUATES IN DEMAND Regardless of age or education, you can learn profitable trades in a few months in this foremost training school and bo in demand for good jobs. More than 30,000 graduates. EARN ROOM AND BOARD Seventy-five per cent of our students earn living expenses while receiving training. We help you get a job. Write and tell us your financial clrcumstances. RAILROAD FARE ALLOWED For a limited time we will allow your coach railroad fare from any part of the United States to Los Angeles, We can- not guarantee to continue this remark» able offer indefinitely. TRAIN IN LOG ANGELES This is the ideal city, Center of great- est activity, in radio, talking pictures and electricity. Approximately one bil- lion dollars belng Invested in California in electrical development, including gi- gantic Hoover Dam, L. A. Power Aque- duct and Central California power pro- gram. This means new jobs for years to come. QUALIFY AS A Radio Repair Man Television Expert Control Operator Station Technician Sound Expert Ship Operator Broadcaster Electrician and many other jobs COMPLETE COURSES We offer six complete courses at low tuition fee originally asked for only one course, You are trained in fundamental principles of electricity and radio work, you operate actual equipment under personal directlon of experlenced instructors and learn by actual shop experience. Upon graduation you can qualify for scores of good jobs anywhere. Oldest ASK FOR DETAILS | Trade School Send coupon for descriptive lit- a i erature. You owe it to yourself in the West to become thoroughly acquaint- ed with this great school. You Est. 1905 will find the facilities, here a positive revelation. et new book, which gives you all the 30,009 facts in story and pictures— Graduates SEND COUPON AT ONCEI. ADIO c ELECTRICAL SCHOOL: los Angeles Dept. MMR-8, 4006 So. Figueroa St. Send Book and full details of Courses. Name ......+, Address . City.... eee eee eee eee eee ey

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FOR INVENTORS And Mechanical -Minded Men to O Aa DA = © 10 Answers Questions on Page 33 Ey patenting the invention. Send sketch or model and descrip- tion with search fee to a registered patent attorney. 1101 U. S.—1279 Foreign. Abraham Lincoln. 17 years. It confers on patentee the exclu- sive right to make, sell and use the invention covered by the patent. No. Pencil sketch and description will usually suffice. A form on which an inventor may execute his sketch and descrip- tion. When properly filled out it is documentary evidence of your conception of the invention. Because a layman or a lawyer in general practice is not learned in patent office practice. As soon as patent application covering the invention is filed in United States Patent Office and official receipt received. CLARENCE A. O'BRIEN Registered Patent Attorney 317-J Adams Building Washington, D. C. (Copyright Clarence A, O’Brien) TO OBTAIN A Small Ideas May Have Large Commercial Possibilities. If you hope to realize profits from your invention, you must protect it with a United States Government. Patent. Otherwise you may find that all your time-and labor have been lost, because it often hap- pens that other inventors: are work- ing on the same idea. If you have an idea, take steps to get a patent at once! THE Free Book shown here was pre- pared for inventors, to show them exactly what steps they must take to secure a PATENT. If you have an idea, you should send for this book AT ONCE. It will tell you exactly how an application for a Patent is made, what infor- . mation you must furnish your attorney, and: what steps he must take in order to protect your interests. Remember, inventing an article is one thing—secur- ing the exclusive right to manufacture it, use it or sell it is another. Without a U. S. Patent, you cannot expect to reap the profits that your invention may make possible. Send at once for this book. After you get that, you'll know exactly what to do to protect yourself, Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers

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l A y : $ KNOW HOW to START. KNOW EACH STEP to TAKE : Before Going Too Far With Your Ideas “Very often, the patent procedure is what we call a “simple” one—as illustrated here. My FREE BOOK “How to Obtain a Patent” describes what to do and how to go about it. Send for it by all means—let me urge, however, that you take the first step (STEP NO. 1 to right) without further delay. It will prevent wasted work, mis-steps, and going ahead “in the dark’’—your whole patent procedure depends upon the first step. Immediate Search Necessary A Search at the U. S. Patent Office will disclose one ef three things: That you have hit upon an entirely original idea—that you have suggested patentable improvements upon an existing invention—or that your invention has been anticipated throughout, and you should drop it. You should have this information at once. The Search Fee for the First Step (the search) are ehe whole procedure at | Send for 745 FREE obtaining a patent) will

be thoroughly explained to you in my FREE BOOK. My FREE BOOK tells everything you need to know about patents. I will mail this book upon receipt of your letter requesting search—or if you want to read it before having search made, simply fill out the coupon below. ALSO FREE RECORD OF INVENTION BLANK This FREE Record of Invention Form en- ables you to make in convenient form a sketch of your idea and have it witnessed in a manner of value to you should the oceasion for evidence arise. MAIL THIS COUPON TODAY and obtain my FREE BOOK and Record of Invention Form. ENT STEP NO. 1 Make a rough pen- cil sketch of your invention, describe it fully, and send it to me for prelimi- nary search through U. S. Patent Office —fee $5.00. My trained search- ers will then make a preliminary search of the pertinent U. S. Patents to deter- mine if your inven- 8 tionis probably pat- Į entable. STEP NO. 3 # My complete report of search and opin- - ion on patentability will be mailed to you with copies of U. S. Patents that I consider nearest to your invention. - STEP NO. 4 If you decide to make patent appli- cation, for custemary fees explained in my booklet, my drafts- men will make draw- ings and proper pa- pers will be pre- § pared for presenta- } tion of your inven- I tion to the Patent Examiner.

<v ann E A.O BRIEN RE GISTERED PATENT. ATTORNEYS 317-J ADAMS BUILDING 5 was HINGTON, D.T. l Please send me your FREE BOOK, “How to Obtain a Patent,” and your “Record of Invention” Form, without ; i ‘any cost or obligation on my part. i i NAME .......00005 E EE EAE LEAT m i 1 ADDRESS ........ PEE E T Seager esau: ET wet 9 |] 4 B 8 (Important: Write or print name plainly) Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers

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WE NEED SALESMEN QUICK! _ a Industrial Recovery responsible. Our Automatic Tacker in demand by over 50 industries. We need men NOW. to open new accounts and supply old ones as every sale starts a continuous use of our staples. Commission paid on both machines and staples. Steady in- come from every account opened. WRITE TODAY for representa- tion, giving territory desired. Sales- ` man’s demonstrating sample $3.50, subjecttoreturn. You, earry no stock. Commissions paid on shipment of orders. THE BURGESS COMPANY, INC. Dept. MM Beaver Falls, Penna. __ HIGH POWERED TELESCOPE. 4 GENUINE BROWNSCOPES AT AMAZING PRICES Most Powerful In America for the money! 16 Fower long range telescope, Can see moon’s Craterg er time on pocket watcha block away. 5 sectione. Approx, 3 ft. long. Finelenses, Brass bounds Can be maed app gertu mioroacope ol. magn. « Only $1.69 poet- paid C.O.D. 24c extra Snecial Super Sim Power 30x ‘Telescope imflar to above but more fol. Guaranteed lo seo 900 timeslarger in gal: id Zaca ana 30 times sioner. Si mm. objective 4 power- u EN. . rt féstare oiy 2% eld pela lea powerful microscope BROWNSCOPE Cp. Dept. X-22 234 Fifth Ave., N. Y. TRAFFIC IS INCREASING—=MEN NEEDED NOW GOOD PAY for actlve men—19 to 50—1n the Rail- way and, Bus Passenger Tratfic Fleld. Healthful, interesting; travel or stay near home. On comple- tion of a few weeke’ home stùdy, we will place you at up to $140 per month, plus expenses, to start,or refund tuition. Rapid advancement. Costs little: terma Free Booklet. STANDARD BUSINESS A " © 2 ‘RAINING INSTITUTE, Di 108, Buffalo, N. To Plate Auto Parts, Reflectors, Bathroom Fix- ‘tures, Hefinish Beds, Mirrors, Chandeliers, by ‘new method; no capital or experience required. Simple plan of manufacturing at home starts you in big-money making business. Outfit fur- ‘hished. Free particulars and proofs. ‘GUNMETAL Co. Ave. P Decatur, Ul. Learn Public Speaking At home—in spare time—20 minutes a day. Overcome ‘‘stage-fright,’’ gain self-confidence, § increase your salary, through ability to sway others by effective speech. Write now for free booklet, How to Work Wonders With Words NORTH AMERICAN INSTITUTE, Dept. 205C . 3601 Michigan Avenue, Chicago, hunois RADIO ENGINEERING, broadcasting, aviation and police radio, servicing, marine radio telegraphy and telephony, Morse telegraphy and rail- way accounting taught thoroughly. Engineering course of nine months’ duration equivalent to three years of college radio work. School est. 1874. All expenses low. DODGE’S INSTITUTE Catalog free. Fern St. Valparaiso, Indiana Get Better Reception with “‘ANTENEX” INDOOR AERIAL Efficient device which eliminates all outside wires, reduces static and minimizes inter- ferenco and hazard from lightning. Easy to ‘Jaffix to old or new sct . . . and what a dif- | ference in the reception! At all dealers, ig or you may order direct. $1 m.o., check or postawe brings ANTENEX to you but be sure to mention dealer’a name. « M. Fleron & Son, Inc. Department M-1 Trenton, N. J. Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers > Ea. mes ee ee. a ___— a ee e N O A aa moon Aron Gan Ou -Er el ma n n u mm man ma m n me a B E A a A å a a e peil mS Da aA A M E A A A ma ma amy g eee — a omean wa E mn ei poma At ee PEO a A ee Ot EA Ba Tu ere See we ea of Bee bs EY aed fet pa RE Eee =u oa wwe ee of EA Try ne D A Oe wl eee = uO å ba ee oe et wu eee —=—_ Y um ee eee eee BOOKS SENT FREE! ži N APPROVAL is o 4 SVOLUMES BRAND NEW EDITION So Sccus Only 15 minutesa day with thèse WONDER. BQOKS whi prepare you for a good drafting Job in less than a year. Mechanical and architectural drafting from simple straight. lines to important complex plans. A step af atime! Bullt especially for beginners, for men with only grammar schooling. Drafte ing 'room practice, PLUS ENGINEER- ING, made easy and clear, Includes com- plete course In blue-print readi Big Field Big Demand Competent draftemen sre urgently needed right now in all building and manufacturing linea at $50.00. to $100.00 a week. That's EY the beginning—FOR DRAFTSMEN HAVE THE BEST CHANCES FOR ADVANCEMENT.. Pleasant, Ieecinating wack, enay to learn ond do. Learn quickly with these booke sond coupon for a eet FREE end for yourself. A year’s consulting membership in th qi: Technical ‘Socidy now - For Beginners Written, so you can understand every word, by 22 famous engineers end archi- tects. DeLuxe flex- ible binding, nearly 2,000 pages, 1546 blue- rints, charts and jiagrams; prepares you for a good drafte ing job in mechanical or architectural lines. Sent for 10 days’ free use if you mail coupon immediately. free to ail readers of thia famous cyclopedia: of |= Many say that iè te than the coat of the books, worth more drafting. Complete set of drawing instruments if yow send for these drafting books NOW. Those instruments are made of the finest of German silver, are absolutely accurale and are packed in velvet lined leatherette pocket ease. Real $10 value, but free to you with these books. E AMERICAN TECHNICAL SOCIETY Dept. DC-320, Drexel at 58th St., Chicago, II. ee ee ee es —— - American Technical Society, Dept. DC-320, Drexel at Sth St., Chicago, ilt- Send for 10 daye’ free use New 5 volume eet of drafting. I will pay the few cents delivery charges. 1f1 wieh, l may return books in 10 days and owe you nothing but if I decide to keep them, I will send $2.00 efter 10 days, then only $3.00 a month until $19.80, the special Introductory price, ia pald. Send latest edition and include drawing instruments. Name. Address -. Attach letter stating age, occupation, employer’s name and address and that of at least one business man as a reference. RAISE TWO-POUND BULLFROGS! Start anywhere. No food to buy! 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INVE pA Your Patent Application Must be filed for Examination by the Examining Corps in the U. S. Patent Office. Choosing your Patent Attorney is an im- portant matter, Why not select a Registered Patent Attorney having had personal experlence in the Examining Corps of the U. S. Patent Office. Mail coupon today for Free Patent Bookand . Record of Invention’’ form. Send sketchor model with special introductory fee of $5 for prompt pre- liminary investigation and reporton U. S. Patents, ` MILLER & MILLER REGISTERED PATENT ATTORNEYS FORMERLY IN EXAMINING CORPS U. S. PATENT. OFFICE | l 1638 Woolworth Bldg., Dept. B, New York City i 203 MILLER BLDG., WASHINGTON, D. C. O Please send me your Free Book, “How to Obtain | a Patent,” and your “Record of Invention” form. a Enclosed find sketch or description and $5 for pre- liminary investigation and report on U. S. Patents. | | NAME oop 08 tps cx te tM ses INTO pied SS rc eran alt [ | ADDRESS e aee aaka ah | i PATENTS BOOKLET FREE HIGHEST REFERENCES PROMPTNESS ASSURED BEST RESULTS Send drawing or model, WATSON E. COLEMAN 724 9th St., N. W. Patent Lawyer Washington, D. C. Protection with- ATENT EPRA your. DEAS Hea BROADWAY Sist. NEW YORK out obligation REG. PATENT ATTORNEY PROE ENGMEER | Nomo l TRADEMARK sy WHAT IS YOUR INVENTION? Send me a simple sketch of a model for COUPON Please send me full information and literature about Patent HOW AND WHERE TO FIND GOLD U d P Gold Miners, seekers Sed Dy Frospectors, > ta gari grepe: i e moe! reaching corners of the world. With the new high price for gold, thousandshavetarnedback to the earth to earn a living. Many have become wealthy extracting golden treasure from the earth, for there are still fabulous fortunes to be found by those who are alpped with ‘the proper knowledge. hy wait? The earth's golden treasures arb laid out before Py explained in detail in our new prize book, “HOW AND WHERE TO FIND GOLD", the most complete treatise on gold hunting ever published. Tells how to prospect; what to look for: and methods of finding focations where fortunes may be found. A genuine education, and ready reference guide for i every lan Pana ee i join the thousane s who have benefited by a: amail nt in eB! ving iness in e World. en Or your co} KNOW AND WHERE TO FIND COLD? today, 1884 baition juot Ja ths trace, Beautifully bound, gold stamped, and illustrated. Price now only $1.50. C.O. D. orders filled in U. S. A. G. L. GUGGENHEIM CO., PUB. Dept. 11H, 112 Sutter St., San Francisco, Calif. 142 Fortunes in Needed Inventions (Continued from page 75) This knife not only permits the operator to cut through many thicknesses but at the same time allows him lo follow the outline of the pattern more closely. While a housewife who sews only occasionally could not be expect- ed to buy such an expensive machine, there is no reason why she would not buy a me- chanical knife of the rotary kind that would sell for one dollar. The knife could be oper- ated with the sewing machine pedal or motor. A low-priced clothes line reel that will automatically wipe the line off when it is taken out and replaced on the reel would be bought by several million housewives. The man who is able to invent some sort of a blotting device that can be carried in the cap or on the end of a fountain pen will make himself a tremendous fortune. Who has not seen the owner of a fountain pen waving a freshly written check through the air to speed the drying of the ink? Millions of people would use a special cork for the ordinary ink bottle. The stopper should open easily when the pen is dipped in, but close automatically afterward. This would prevent accidents through spilling and eliminate any need for the original cork. A toothpick dispenser for restaurants that will give out only one article at a time is bad- ly needed. Remaining picks should be in a dust-tight container where they cannot be touched by hands of other people. One of the most valuable instruments on the panel of an automobile would be an oil viscosity meter to tell the motorist when to change his oil. There is also needed a closing device for auto gas tanks to replace the cap. Caps are easily lost, and are often put on too tightly. What is needed is a closing method that will easily open at all times, and at the same time provide a perfect seal for the tank. A cheap little nickel or ten cent gadget that will really stop the rattle of car windows will also find a big market among owners of old automobiles. June 3 Teaser Contest Winners HE three teasers in the June M-M contest indeed proved to be tricky. Most entrants obtained the correct answer of 571 lbs. for No. 1, those who tried rolling two coins around agreed that 2 times was correct for No. 3, but answers to the clock problem va- ried over a period of centuries. March 21, 1900 is the day when all three clocks will first be correct at noon. The simply stated but absolutely correct solutions of Jack Wasserman, 16-year-old high school student of Bronx, New York City, bring to him first prize of $10. : Thomas Gaffney, Jr., sophomore at the University of California, receives 2nd prize of $5. Prizes of $2.50 each go to Henry Lacrampe, Oakland, Cal., Charles Smith, Wil- kinsburg, Pa., Emile Kamps, Montreal, Cana- da, and Theodore Hetze, Eau Claire, Wis. Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers

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GIVEN WITHOUT COST „Over 300 Dandy Big Prizes Including a Speedy Motorbike! o5 BOY! Here’s your opportunity to win over 300 big prizes without cost! Get this 1934 deluxe model motorbike, fully equipped. Win a printing press, open a shop of your own, and makemoney. Or get this radio Microphone and go on the air! Heaps of fun. . .. Besides these wonderful prizes, you can earn CASH PROFITS. It’s easy! Just deliver 3 fine magazines to customers in your neigh- borhood. No experience necessar Mail the coupon NOW—and we Ji start you! Yov’ll have lots of fun studying . the moon, stars, birde, and wil life with this telescope. Ten power. Mail the coupon right away, and start winning it. Jim Thayer, Dept. 397 The Crowell Publishing Co., Springfield, Ohio Dear Jim: I want to earn MONEY and PRIZES. Start me at once, and send me a big Prize Book, showing over 300 prizes that I can win. NEEE EIA A AAR he cies ads E Ee ria AOOO E EEEE Mail the a a ` I Geass act isa A ONEN 3 -IEAA ORAE EEE ha N iail the ; Citeam Bta tensoro Age. AT THIS LOW PRICE — MORE FOLKS WILL BUY! Why are over 95% of auto sales in the “under- $1,000” class? I'll tell _you—folks want Excellent Quality, for a LOW PRICE! It’s the same with Ol Burners. A few rich folks will buy the high- priced burners, But if you want lo make lots of sales, you've got to offer a surcessful LOW-PRICE® burner. And—HERE IT IS! World’s Lowest Priced! Made and guaranteed by the largest exclusive oil-burner manufacturer, A really, Piris Burner, for sot 1a. $60 less than usual il prices. ompletely automatic, thoroughly dependable, mar- velous heater, very economical cf fuel, approved by the HOW TO GET BURNER Underwriters Lab, WITHOUT OBLIGATION! Here’s how we do it—(1) Cur factory is located in a 3 i ee suburban territory whero overhead costs are very low. (2) Just mail the coupon. I'll write you how We now sell Direct From Factory to Dealer, saving you the you can get a Samplo Burner—Shipped on e x ial distributor's profit, Approval—Subject to MWxamination—Abso- Write for Specia isir pront: luely Without Obligation! i -An ¥ If you are handy with ; y Shippecon Area EASY TO INSTALL! 3yo an prany po Enesa inet inoa ak Sek iei pian: Sen $ install it oar Poll directions piven, ioe eee ae details of this Special Offer—Free Booklets L. A. I ypes with improved features that give a richer, slower-burn- ae ss Ts é QOCKL a T paue, open e at a real fuel saving. . - wä n T Low: Bricos, Mall itne cou res. $ or New Plan, offering to ship you a Sample. Burner he without obligation. WRITE TODAY! Pisce o = TRER — LACO OIL BURNER “ 284 Union St. Griswold. Ña "i » fa. - COMPANY. 4 1 Please tel] me about your ”Shipped-on- 284 Union St. ‘Approval!’ plan—end send free Docks, with GRISWOLD: AOWA .- low prices. Exclusive: Builders Strect -ọf Oil Burne r Toan burners— ‘OVER 15,000 NOW: IN USE! Thank You for Mentioning Modern Mechanix and' Inventions for August When Writing to Advertisers 143

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Learn to draw beautiful girls’ heads and figures for pleasure and profit—most fascinating—ro- mantic—highly paid branch of the art profession. If you like to draw you can learn to draw—at home—by mail. In our amazing new easy course we use the methods of the large art academies and institutes at less than one-tenth the cost— you study directly from beautiful photographs of models just as they pose in the classrooms. This is a real opportunity for those who can not take the time or afford the great ex- pense of golng to large cities to develop their ability and to realize their ambition to become an artist. No experience necessary. Artists make big money at home. Complete course consisting of simple. instructions. comprehensive charts, diagrams ‘and pictures of beautiful artists’ models ready to draw. now offer- ed to you at very low price and on easy terms, First Lesson FREE Start your art career today by sending your name end ad- dregs and only ten cents to cover mailing cost and we will send you the first lesson—try it free. You will be delighted with the quick and certain progress you can make right from the start. Send Today for Free Lesson and Special ‘Offer. TOWERTOWN STUDIOS Dept. A-9. 520 N. Michigan Ave., Chicago, IIS. Pay $15.00 to $30.00 $ 1 95 for AERO [balloon] im? é wheels 10’ size complete! for your midget auto, light airplane or pushmobile? BUILD them yourself for only $1.95 complete. (10’’ size.) Use only cheap easily obtained material—no special tools or workshop necessary! Simple— Sturdy, long lived and foolproof. $1 00 brings you full scale simplified blueprints, photos, and detailed in- a structions and FREE midget car blueprint. OR, send only 20¢ in stamps or coin and recelve FREE car blueprint and complete in- formation on these wonderful wheels (10"’ to 16"’ sizes.) Don’t delay —Send today! WEBB MANUFACTURING CO. KEARNEY, NEBR. or Money Back! AFTER Picture shows Mr. Rochin before and after using P. T. M, BEFORE Formula. He says: ‘I have used P. T. M. for four weoks and tho pyorrhea has absolutely disappeared, leav- ing my teeth and pums in a normal, healthy condition— thanks to your wonderful remedy. My dentist could hardly believe such a change possible. { surely hope that the thousands of pyorrhea and trench mouth sufferers learn as _ l did, that at tast there is relief from these dreaded con- ditions.”—Paul Rochin, Los Angetes, Cal. Don’t lose your teeth! Use P. T. M. Formula, painless, economical homo treatment. Positively guaranteed to stop Pyorrhea, Trench Mouth, Canker, Mouth Sores and restore your gums to health or money back, You be the judge—nothing to lose, your health to gain, Many dentists use and endorse P. T. M. It is a new principle, sensationally effective. If your gums are sore or bleed, your teeth loose or pus pockets have formed—use P. T. M. Formula. Even if it is in an advanced state P, T. M. gives you complete relief or your money back! Write now for full information. P. T. M. Formula Co., 4030 Wilshire Bivd., Los Angeles, Gal, 144 New Brush for Washing Cars! Attaches Washes to Entire Gard Car Hoe —Spokes and Ail The Beisser Auto Brush! Washes awholecarin§ minutes. Does away with messy pails and sponges. Fastens on garden hose. Regulates water without going near faucet, Quickest and cleanest way of washing a car. Not even necessary to put on oldclothes. Does complete joh— even under fenders end between spokes. Length, 22 inches. Aluminum’ —lightandeasytohandle. Exclusive territory todistributors. 100% profit. Write for FREE .CIRCULAIt—or send $1.50 for sample.. BEISSER AUTO BRUSH CO., 422! Woodward, Detroit, Mich.” ET SERVICE BOOR FRE For 30 Days Reading No Money Do: Actual Crime Cases— Uf You Act Quickil—We will send you this stirring book on Crime Detection, Secret Service and Iden- fi tification Work for 30 days free reading. Send no f money. If you decide to keep it, then send only $1.00; If not, return ft. WRITE TODAY. Nok sent to boys under 17 years of age. e, Book Dent. C-235, 1920 Sunnyside Ave., Chicago | New occupation, Pays big money atonce without investment. Introduce sensational new line 5e and 10¢ necessities to stores. Self sellers. Permanent repeat business easy. Experience unnecessary. Start free. Write PRO-CO-PAX > Dept. 37-Z 3 1956 S. Troy OFFICIAL BOY SCOUT SIGNALER $1.50 Radio, Blinker and Telegraph with batteries Fun and education combined! Set consists of high pitched radio buzzer, Hght blinker, telegraph sounder} operated from 2 self-contained flashlight bat- teries. Pocket size: removable bulb and guard. Black and nickel finished case. Convenient switch so you can change from one circuit to an- other. Two sets can be connected and secret messeges sent or received, Send at once for thia entertaining and instructive set: $1.50 in m. O., bills or check; C. Q. D, if.preferred. M. M. FLERON & SON, Inc. Dept. M-2 Trenton, N. J. AUTOMOBILE COMPASS Have you ever talten the wrong road and traveled many miles before discovering your mistake? This new AIRPLANE TYPE COMPASS constantly tells your direction of travel. Sticks to windshield. Basa 1% diameter. ONLY $1.50, POSTPAID, SA'I- ISFACTION GUARANTEED or your money refunded if returned within ten days. Agents Wanted! Box 246-A8, WARREN, OHIO HULL MFG. CO. Have you got your copy of the big 146 page 1934 HOW-TO-BUILD-IT Book? On sale at newsstands, or sent postpaid for 50c = A Modern Mechanix book. B P PROTECT > YOUR S IDEAS. E ERSONAL FATENT DERVICE I offer a confidential service as your personal representative in Washington on all patent prob- lems, trade-marks and copyrights. Prompt action assured, at a minimum of expense. Write me personally, today, for valuable 72-page booklet aad Beodo e 1, RANDOLPH -Vention’’ form, free. 527-D, Victor Bullding, Washington, D. C, Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers

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ed j The Dies) Engineering feld a a opening so rapidly on lan he Power of water, and in the alr that there J is already a great acarelty of > ? Ò trained men. Fomore Amita hint d Z arin or Engineers and Firemen — can finish jal year the new Diesel Engineering Course j at repared for home study, Complete employment service included, or Free Bulletin TODAY. No obligation, American School, Dept. DC28, Drexel at 58th, Chicago 14" DRILL PRESS, Another “American” triumph of design, cutting the cost of homecraft tools in half. Takes 14°’ drills, height 22’’, weight 24 lbs:, floating spindle, 1%’? column, depth- stop, spindle lock. Price, less chuck, $6.95. r American chuck, add $1; for key-type chuck shown, add $5, spindle-shaper attachments $2.50; adjustable motor table $1. Send postcard for complete low priced power teol catalog. At better dealers, or shipped direct on receipt of $1, bal. plus expressC.0.D. AMERICAN MACHINE & TOOL C Dept. X.D. 00 Broadway, New York Make Money at _ GROW our. famous. Fancy White Queen Mushrooms. Experience un- Necessary—wve teH you how, Big de- mand, at highest prices. Marketing facilities furnished. Tustrat- ed book free. Write today! AMERICAN MUSHROOM INDUSTRIES, LTD. 68s Woolnough Bldg. «1 Toronto, Ont. == “TE THE BACKS OF ANY PACK OF CARDS Turn ACES, KINGS, DEUCES or any other cards face up at will. There is a scientific reason. MOST BAF- FLING CARD TRICK just discovered and copyrighted. ABSOLUTELY and POSITIVELY a guaranteed il- lustrated solution of reading the backs, for 50c (coin). We R. DAVIS, Box 594, MULLAN, IDAHO at HOME Make money taking pictures. Prepare quickly duri ” aranma T a ery seu tara Aer Nd . Ti Qol! PHOTOGRAPHY, and full particulars. E SN MODER AMERICAN SCHOOL Dent. 205-€ 3602 Michigan Avenue He PHOTOGRAPHY ciie cago, U, S.A. HERE'S the ANSWER !! Where can I get advance dope on new European INVEN. TIONS? If you want to get on the mailing lists of hundreds of ‘European Manufacturers and receive Samples, Catalogs, Sales Plans, Money Making Plans, etc., from Europe, mail $1.00 now with your name and address to . INTERNATIONAL AGENTS EXCHANGE Dept. M. M. 192 N. Clark St. Chicago, Illinois LONDON - HAMBURG e CHICAGO NEW KIND OF KNIFE for every KITCHEN, OFFICE, SHOP Revolutionary.. two cutting surfaces on one side and an extra point in the center, Saves time and effort for housewives, office men, shop workers, Finest steel. Handle fts snugly n hand. Fully Guaranteed. Order today. OnLy $1.00. (Illustrated descriptive folder sent on request) HANDY. KNIFE COMPANY. P. O. Box 479 Houston, Texas: Thank You for Mentioning-Modern Mechanix and Inventions for August When Writing to Advertisers i plug in and use. NOW YOU SHOULD PREPARE /or | ELECTRICITY Vil Finance Your Training! Come to Coyne for 12 weeks—I'll give you a training by the Famous Coyne “Learn by Doing’? method. Then I'll give you the help of my-employment department in getting a real job. I will finance this training for youand you ean pay your tuition over period of 15 months after you graduates LEARN IN 12 WEEKS My training is practical—youlearn by work- %9 ing on real actual electrical machinery H and not by books or lessons, We cut out all useless theory and give you the training you need for success in 12 weeks. This New Age Demands Practical Trained Men Get ready new for the great new Prosperity. Thousands of trained men will needed. i Thousands of opportunities today. The new age demands more than eyer—men with a spe ecialized electrical training. Get into jectricity where you can learn to earn $354 ‘ week and up.Mail th gend you full particulars of my special offer— Tilsend you my big free book which telle you how many earn while tearning— my offer of Electric refrigeration course at no extra cost, EPN details of my pay after graduation plan. COYNE fc tewis President 500 S. Paulina St., Dept. 64-59, Chicago, Ill. H. C. LEWIS, President, Coyne Electrical Schoo! 500 So. Paulina St., Dept, C4-53, Chicago Send me full particulars of your special offer and pay “Tuition after graduation plan."” e coupontoday and Pll Same Quality String ; $ 65 Asin Expensive Racquets aning te Con plata ith 18 Easy to restring racquets—better that pew. Saves rea] money. Send for thie professional oatfit today. Goo q profits made reetring ne other players’ racquets. 97 ft. string, colors Purple, Green, hite— also Scarletand Biack Spiral—with contrasting silk fm ala, jitaatrated easy directions. Money back guarantee. MAKE Send check or Mi Order $1.65 mich, MONEY ! inclades Posta e Ad n, Son ©. D., if desired. 16c extra. Pro Tennis string Co. Dept. W-5 ALL-WAVE “AIR SCOUT” 10c to cover printing and postage, brings you val- uable data. on ALL-WAVH receivers. Send at once. Harmon, N. Y4 Invented by H. G. Cisin. Pat. Pendg. U. S, Ser, No. 592,536, shown here. Only set of its kind In the werld. POWERFUL! Operates di- rect from any house current, AC or DC. Gets all standard broad- cast stations, police calls, FOR- Complete with 2 tubes, earphone, 2 colis covering band from 70 to 550 meters, ready to $8.50 Postpaid - EIGN stations, code and trans- Same as above, without Atlantic phone conversations. earphones. ,. ¢8,00 Uses 5 plug-in coils, band 10 to Postpaid. ees- 550 meters. Compact, portable, Battery operated ALL- operates several headphone sets WAVE “Air Scout’ "com. simultaneously. plete with tube, earphone, ` two coils, data fnsLruc- lions, assembled,. wired, Teudy to use,. NOTHING ELSE TO BUY. except Inexpensive bat- $5. 95 teries. ‘Postpald Same ds aboye, but in kit form. $5. 00 Postpaid...... ' ALL-ELECTRIC sets not available j in ‘kit form. Send check, money-order or bills. All prices for delivery in U. S. A. HAMILTON SPECIALTY COMPANY aii Dept. Z . 135 Lockwood Ave., New Rochelle; N. Y. 145

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New Jnventions Speed “Business “Recovery Silvery metal foil cemented to each side of this insulating paper bounces back at least 95% of heat rays coming through walls. Heat is kept out in summer, inside in winter. An earphone amplifier placed on a stand before any radio loudspeaker brings radio programs to those who are hard of hearing. An inventor’s service bureau brings new inven- tions to the attention of interested manufactur- ers before patents have been granted. Needed information is collected from patent attorneys each month. A laminated bakelite cross-hatching guide for draftsmen eliminates eye strain. Device is easi- ly used with triangle and T-square. A new radio antenna system is so effective in shielding out man- made interference that an X-ray ma- chine operating in the same building produces a hardly noticeablehum. Spe- cial antenna, shield- ed lead-in, and units are used. Painless hypodermic shielded co upling A single lamp bulb with three, different possible wattages gives flexible illu- mination for ‘homes as well as stores. A 100-watt and a 200- watt filament give three combinations. Clothes lines are held firmly in place without tying knots, but released in an instant by a simple little locking device. Changes in outside wind velocity oper- ate a simple auto- matic furnace draft control that saves fuel. A mercury bal- ance tube permits fine adjustment for any temperature. A new window sash lock eliminates en- tirely the need for weights and sash cord. Requiring the drilling of but -one hole, the entire unit is invisible from the any height. Current is carried by the two side arms to adjustable head of. this unique new flashlight. With case standing on end; light may be focused in any direction by tilting the head. outside. Window locks at Push on plunger of newest variation of ice cream cone brings out more of contents with no dripping, as with cone, 146 injections are possi- ble with a hypojec- tor. At a touch of the tiny trigger a concealed spiral spring forces needle into skin with speed comparable to that.. of a rifle bullet. Wheel exerciser now being installed in German gymnasiums. Cross rod changes angle and height as wheels are turned. _ Editor’s Note—Addresses of manufacturers ` of these and other new products in this issue can be'obtained by sending stamped, ad- dressed envelope to MopERN MECHANIX AND Inventions. Manufacturers are invited to submit photos and literature for this page.

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} AT TIMES LIKE THESE YOU'RE GLAD THEY RE FRESH CITY POWER HAD FAILED ...during a mastoiditis operation. Then light, blessed light... from the flashlight of Nurse Bell.* In- stantly Dr. Seott* was at work again...A life had been saved. There’s the Date-Line... a guarantee they’re fresh RESHNESS in flashlight batteries is absolutely nec- essary. For their light-making elements are active chemicals. Naturally they’ve more power when they’re fresh! The “Date-Line” on each Eveready safeguards you... proves your dealer’s statement that the Eveready he sells you is fresh. But the dime you pay for Evereadys buys more than freshness. It buys all-armored construction...a “power-stabilizer” that holds the scientific mix of powerful light-making chemicals on tip-toe, ready to light...and, sealing in freshness, preventing power from leaking away ...a spun metal top. Good measure for your dime? Indeed yes. And truly indicative of the expert workmanship in all “Eveready” prod- ucts. Whenever you buy Evereadys for your flash- light, radio, or motor ignition, you get... packaged electricity at its freshest and best. DANGER IN DARK CLOSETS Your storage closet is unlighted?... National Carbon Company, Inc. General Offices: be careful...guard aes et ila New York, N. Y. head from falling boxes, etc. Use Tin th joer i TE PA pet =) orp ae Tour Eveready, Unit of Union Carbid : and Carbon Corporation. *Not their real names, of course, although their real names were given jn the coast to coast newspaper report, Aas EVEREADY BATTERIES packaged electricity at ito best

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© 1934, LIGGETT & Myers ToBacco Co.

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uble Page Spreads

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OME of the world’s most suc- cessful inventions came from men who didn’t consider them- selves inventors at all. The tele- graph was invented by a painter; the typewriter by a farmer; a poet fig- ured out the sewing machine; a school teacher the telephone; a bank clerk the hand camera and a dentist the stock ticker. Or look at small inventions: husband noticed his wife bending a hair pin to make it stay in her hair, That gave him the idea of the crinkly hair pin, which he proceeded to patent. One day a golfer got the idea—just a hunch —to make a wooden tee. He patented his idea—and every golfer knows that wooden tees are sold by the millions every year. These are but a few of many similar examples in inventive history. That is why we say that the book shown on the next page is for INVENTORS and Other Men with IDEAS. Some men make a business of invention. They make their living—even fortunes—that way. Other men who are not inventors at all occasionally have good, practical inventions which could be patented to their profit and with benefit to the world. Whether you consider yourself an in- ventor or not—if you have a good inven- tion; an invention that will save moncy, save time, save labor, make money or give pleasure—you should at least find out how you can protect your rights to it. And this interesting, new FREE book, PATENT PROTECTION, will tell you. Many Little Every year thousands of patented new ar- ticles are brought on the market—the result of someone's happy thought. Often it is these little, simple inventions—the kind you find INVENTORS AND OTHER} Read What C. F. KETTERING Vice-Pres. General Motors says about Invention Sometimes we hear people say: “Well, there isn’t much left to invent,” But Charles F. Kettering, Vice President and Head of Research of General Mo- tors, who helped develop the self-starter, Duco, and many other outstanding in- ventions, doesn’t think that at all, He thinks just the opposite. In an inter- view published in Good Housekeeping Magazine, Mr, Kettering said: “If we took half the men employed in tool making and put them to work- ing out new inventions, new things, we could snap out of this depression in no time. Our return to normal times de- pends on new manufactured products that will catch the purċhaser’s eye, gat him to buy and thus start the ball roll- ing. Change and buying go together. We're only entering the great period of inventive advancement.” Ideas Have Big on the counters of a l0c store like tha one shown here—that are among the most suc- cessful financially. Whethor your invention is simple or complez—large or small—if it is MEN WITH IDEAS Our Business Is To Help Inventors For thirty-five years, this organiza- tion has been in the business of helping inventors. During that time ideas—in- ventions—from literally every corner of the country have been turned over to us to protect. Some of these ideas have represented large and complicated mechanisms; many others have been very small, practical articles, like a can opener or a new toy. All this has given us a wealth of ex- perience which we place at the use of the inventor of today. What you write us is held in strictest confidence. Here in Washington, near the U. S. Patent fice, we maintain a large staff of ex- perienced Patent Specialists, Draftsmen and Specification Writers to give you prompt and competent service. Yet be- cause we know how to work efficiently— our fees are low; and if desired we are in position to help you with a plan of deferred payments. Delays May Be Costly— Write Us Today In inventive matters, delays can often provo very costly. It frequently happens that Lwo or more inventors will be working on substantially the same invention without each other’s knowl- edge. And the Patent Office rules place the burden of proof on the man who gets his Patent Application on file last, So if you have an idea —YOUR VERY FIRST STEP is to find out exactly what to do to protect yourself. That ia a step you can take today—right away in fact —by sending for your copy of PATENT PROTECTION. Commercial Possibilities new and useful, you owe it to yourself to find ‘out how you can protect it. Send for a FRENG copy of the book, ‘Patent Protection,” NOW. | This Book TELLS YOU: How the Patent Laws protect you and why, if you have a good inven- tion, you need a Patent at all. What to do to make application for a Pat- ent; just what informa- tion’ a’ ‘Patent’ Attorney neéds to-help you. What kind of a sketch or model is needed, What simple steps you maybe able to take right away to help claim, your right to'your invention,: even , before your-miake- application for'a Patent.” How some successful inventors have. secured finaticial ‘assistance to help. ‘them’ in the de- velopment of their in- ventions, gyn Tells you about in- teresting inventions that have proved successful and illustrates - impor- tant mechanical: princi- ples that inventors’ fre- quently use in working out problems, PATENT PROTEC. TION is much more than a book about pat» ent procedure. In it we have put the kind of in- formation that we know from long experience the average man with an invention would like to have. The very same day we hear from you—a free copy of PATENT PROTECTION will be placed in the mail to you. Sign and send the coupon. Get that much done teday. VICTOR J. EVANS & CO., MAIN OFFICE: 605-J, VICTOR BUILDING, WASHINGTON, D. C. I am interested in your book, PATENT PROTECTION and your “Evidence of Invention” form. Please send both. of them FREE and without obligation on my part. Name Street and No. City*or Town... “Have this Cou MAIL to WASHINGTON Ai E ET (Be Sure to Write or Print Name Carefully) pon in the — A ‘With this interesting book, you will also find an “Evl- dence of Inyention’’ form, which makes it easy for you to sketch and describe your idea as a matter of record. This is an important step if you haven't taken it already. The book will tell you how to use this record and why. It also comes to you without any charge or obligation, SY te ere Pee Other Offices: 1640-J, Conway Building, Chicago; 1007-J, Woolworth Building, New You ites 514-J, Empire Building, urgh; 1010-J, Hobart Building, San Francisco. 605 J-VICTOR BLDG, WASH. D. Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers 17 VICTOR J.EVANS £ CO! 16 Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers

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RANDOM CHIPS from the Here our readers tell what they are doing. This month’s stack of letters reveals boy, just 14, who flies, explores under water and speeds over ice with MM projects. Chicago, IIl. Dear Editor: Herewith are two snapshot views of the short wave adapter that was in your March, 1933, issue. The first station brought in was an amateur in Columbus, Ohio, without any antenna on my six-tube midget set. This was my first attempt at building a short wave set. MIM’s Radio Sparks helped A. E. McDonell, of Spokane, Wash., build station W7BRG, shown above, and win first prize in radio pheto con- test. The station walls are decorated with more than 700 QSL cards. ADIO “hams” swamped the Workbench with photos of their outfits for the radio picture contest announced in the May issue. Acter hours of careful selection and elimi- nation, the judges found two which were considered the best. First prize of $5.00 was awarded to A, E. McDonell, of Spokane, Wash. His amateur station, W7BRG, is jammed with kinks and ‘sets from MM’s Radio Sparks department. McDonell says: Dear Editor: Spokane, Wash. Here’s a picture of ry set up. Some of the ideas I got out of ycur magazine. I had to take two shots to get all the station. A. E. McDonell. * k * Size of outfits did not influence the deci- sions of judges. That is the reason second prize of $3.00 was awarded for photos of a short wave adapter. Stanley C. Mosher, of Chicago, won the prize with a police call box described in the March, 1933, issue of Movern MECHANIX AND INVENTIONS. Here’s part of Mosher’s letter: This midget car has a one-horse motor and will do 24 miles per. J. B. Handy offers to give MM readers details. 20 Stanley C. Mosher. * * * For an indefinite period the Workbench will award three prizes for the three best photos published in these columns each month. This monthly contest is open to all readers. Photographs of anything you have built are eligible. All you have to do is snap a picture and send a print to the Workbench. Don’t for- get to send a brief letter along. The more in- teresting the letter, the better chanée you will have. Each contest will close on the fifteenth of the month of the issue of the maga- zine. That is, the contest for this is- sue will close Aug- ust 15. Entries re- ceived after that, however, will not be thrown out, but will be judged in the next month’s contest. First prize is $5, and $3 will be awarded to the second best photo submitted, while the third prize is $2. Send all photographs to The Editor’s Workbench, Modern’ Mechanix and Inven- tions, 529 S. 7th St., Minneapolis, Minn. All photographs submitted are the property of Modern Mechanix for use in these columns. + kd `k Stanley C. Mosher’s photos of his police call box won second prize in radio photo contest. And here’s a young man, just 14 years old, who flies through the air, speeds over ice, and explores under water. He knows how to use a hammer and a few other tools and found interesting things to build in MM. But let him tell the story: Modern Mechanix and Editors WORKBENCH $10.00 IN PRIZES EACH MONTH FOR PICTURES. Read details, then send your photo to the Workbench. Here are the Radio Contest winners. Clearfield, Pa. Dear Editor: A faithful reader of MM I am and I haven’t missed a flying manual since 1930. That’s where I got the plans from which I built the glider. Remember that Northrop training ship? (We do. It’s in the 1930 Manual.) A good landing gear and a small cut down in size are all the changes she got. That iceboat in the picture is the one pub- lished by MM plus the usual change. This time it’s the sail. She folds up for transpor- tation. i The diving helmet is of my own design, Although I am only 14 years old I can travel on ice, under water and through the air and my next will probably be a midget car, . Walter Schaefer. There is no doubt about Walter being areal boy. Here’s hoping for more pictures from Walter and other boys like him. * * * ‘ Another of our readers offers to help any one wanting to build midget cars. Now is the time for the “auto babies.” If you are interested, glance over. this letter: P. O. Box 737 Dear Editor: And still another midget caz, although this one is big enough to be of some good. It’s weight is exactly 200 pounds and it will carry more than its weight up a 15 per cent grade. "Tis powered by a one-horse Nelson Jumbo motor; the rear axle runs on ball bearings and is mounted on rubber; the clutch should look familiar; the brake is external contracting and is actuated by the same lever. Lynchburg, Va. Here is Dean Pittenger’s quarter size version of Doane’s Hydrobout, He had five months of fun building the model. Inventions for August Walter Schaefer (hidden under diving helmet) has had more adventures than many older men with his glider, ice boat and diving outfit, He followed MM plans to build them. The cost was plenty. However, the speed ` is 24 miles per on level and ’tis strong enough for two youngsters of 120 Ibs. each to go all over town in together. I will be glad to give detail information to any one upon request. Although an industrial engineer, and so receiving at my desk dozens of magazines, yours brings the most pleasure in my spare hours. . J. B. Handy. In writing to Handy, don’t forget that stamped, addressed envelope for reply and that reminds us that some of you slip up on this point when sending inquiries to MM’s many departments. * a * Dean Pittenger has found a novel use for How to Build Twenty Boats. Instead of building the full size boat, Pittinger care- fully builds a scale model. This is what he says about the little boat pictured this month: Los Angeles, Calif. Dear Editor: There she is. Five months of a lot of fun. A one-quarter size version of Doane’s Hydro- bout. She is built exactly to scale. Spruce frames, mahogany planking and put together with screws throughout. The engine is one-cylinder, 4-cycle made by a friend of mine. It’s his own design. She goes about 10 to 12 miles an hour with door bell batteries fo rthe spark coil. I will be glad to answer any questions re- garding either boat or engine. Dean Pittenger. 21

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BOYS! BOYS! BOYS! Throw Your Voice Into a trunk, under the bed, under a table, back of the door, into ~~ a desk at school, or anywhere. You get lots of fun fooling the a teacher, policemen, peddlers, and surprise and fool all your friends besides. i THE VENTRILLO is a little instrument that fits in the mouth out of sight. Cannot be detected. It is used in connection with the above, and with the aid of this wonderful DOUBLE THROAT, or VENTRILLO, you can imitate all kinds of birds, animals, etc. Remember you get everything for ONLY TEN CENTS—a booklet giving you R full instructions how to become a ventriloquist and throw your voice, the Double Throat, or Ventrillo, also a copy of our MONTHLY MAGAZINE, “FUN, MAGIC AND MYSTERY.” ALL FOR.ONLY 10 cents. Johnson Smith & Co., Dept. 719, Racine, Wis. 250 MAGIC TRICKS (SILENT: DEFENDER a -t e An excellent little book ear aE I BO frink, Used by police officers, detectives, ona can do. Tricko with “4 sheriffs, night watchmen and othera cards, coins, handkerchiefs, a. as a means of self-protection. Very “yezes, bottles, string, etos effective. Easily fits the hand, the Also Second Sight, Shadowe fingers being grasped in the four holes. Very useful in an emergen- cy. Made of aluminum they are very araphy; eto, Profusely ile RADIO GETS" shows how to mako snd | © Iustentod “100 postpaid > light, weighing less than 2 ounces. Handy pocket size always ready for instant uso. Onerate inexpensive Radio Sets; the ma- j 925 CARD TRICKS snd aleight of hand: Prico25e ea., 2 for 45c postpaid. 770 page Catalog I0e. MAKEYGUROWNRADIO Enjoy the tA or i basoba i? GN ST terialo for which can be purohased for a mera | Contains all the futest and best card tricks as trie, aio file: how to build h short-wave performed by splebrated magicians, ich cen jor bringing in forelgn ei AONB, posure of car ricks UBG profeasjonal Dolice calls, chips at sea; eto, ONLY 15¢ p. gambler, Price 25cucstpaid, oretampes MIDGET BIBLE SURPRISE MATCHES GREAT Ş More fun than ICURIOSITY : fighting with your P rie, ror just Ys H e ordinary 4 rhe matches, As the Y” gr Pages. victim tries to light 10 Beid to bring % one he gets quite a C æ% “Good duok to ; & E | surprise, A grnuine work | Lee f] | Price 10c par bor, 9 boxes for 25e, 92 for 75 conte. of art, Must Si =n ee STAR TOY MAKER Greatest b * bool wien Eee kow to tata È a Pinhole Camera, a Canoe, mod road, lel f Wonderfal inostrumont, xf Everybody de- lighted with it. 7 Odd, Curious and interest- ing. Lotsof pleasure as well palee emt dega ee ie eee e — mo in in; © wonders o! ature. modol Railroad: a Tele Opera Glass, a Stereoscope, & Burning Lens, a Reading anh” Inetrament” Bo x| Glass, & Telescope, & Compass, @ pockeb Mirror, and a fits, Talking Macbina. oscope—for examining eye; ear, nose and throat. 16 Bor Bai HS Kali [ape RO gue ot o locate eyen ORo paiarai nce in tha Water Wheel. Paddle Raft. y . olds flat an Ə pocket, Something great—you e Bos a a p 2 pale of SEls, [noed ono. Don't mias It, Sent by mall. Oniy 350 oF 3 for $1.00. 4 pagos. ob iutan PRICE 10c. . ELECTRIC MOTOR BOY'S OWN TOYMAKER, A new book. | All Parts Nete Tells how to mako chemical toys, electrical f Only An Electric Motor for Onty 10 id s cents. Sounds almost unbe- nN gp | tov, galvanic toys, ‘mochanical toya, essary tor i toya, cardboard toys, bonte, trapa, to: 00 Rans stpaid. 3 tor 260. | illustrations, Price 250 pestpald. Vevable, but it is perfectly FUN WITH MAGNETISM = 50 novel od trus. For ONLY 10centa wo FUN WITH MAGNETISM. 50 novel and f q 5 Withabuneh | uniavo experiments in MAGNETISM. that aw} g gend yon all the parts neces: of theso bills, Ean FD, Berm witb E fuliprinted and illustrated dì- lt 18 easy for magnetio chain, Ñeeing and vecticns for assembling. RU each person mA spinning needle; pail and Ton ther in fact itis PUN of limited HAN? Hall cluster, magnetic Soh, E°! justfollow a fewaimple means to | top, motor, magnotis billiard balls, many other. p instructionsandina APPEAT| Stunts. Aleo interesting information about ‘few minutes the prosperous Lodeote magnetism, electrio ty, eto. PRICE i a p-| mator is ready y flashing N BOATS, How to build rowing, s 2 roll of | ssis boats. Eraythine pertaining to boats A these bills | explained in plain terms so anyone can undere =} t the ctond, Mlustrated. 10e pp be sean to be appreciated, Make good mouey welling them to fri i Sto, PRIOR 150 mnie D ton soa ae tat 1.35, 100 for $7. Al ble fn SERPENT’S EGGS por contains 12 erga, When h a matoh, each one dual: gradual ly Da tohea iteslt into è = Jp ro per|5-MINUTE HARMONICA COURSE, A time and peeling off a genuine Dill | new easy celf-teaching method. Teaches how or two from the outside of the roll, | £9 may, to use the tongue. tremolo, fully the effect created will be found t0 | MONEY MAKING SECRETS. Golden oppor be all that can be Gesired. Prices, | tunities for averyone. 94 page copyrighted teller. The key postpald: 40 BINs 20c, 120 for 50c, | book chook full of money-making ide i oar future, in h " to yı us: formulas, wrinkles, trade secreta, eto, Bus! oF 53.50 thousand postpaid, | ora tio can. fb carted Wik lite ct ne] | 4 a Mt rons ital at h time. 100 NOSE FLUTE | $320 eas mersine pon pentza EAP business? Will i! taing hundreds of eimple éricks, illusions, ou be wealthy? The Maslo Hose Flute, or Ha: Versions that anyone can ‘do. Also expia Bempieve with ` hypnotize, how oval musical instrument thas | secret of second sight. Price 25e post s ; dictionary of to produce sleep, how to Combined” There "ia just. iH WONDERFUL X-RAY TUBE descriptions and correct interpreta- | awaken a subject, how tonyp~ ae korok In playing > wonderful Netle Hons, with lucky apumbers. forpa nolize animals, hypnotism in ich, whan onoo ace instrument pro-|pate daya, oracles, divination, palm- | diseases, hypnotism for scien- uired afti littl istry, etc, Ali tells hi to tell i Ë aoe, will enable you 40 guclng oot oa ll rortunes by various methods, by | tifle practice, illusions and produces verr usions both! grounda of coffee or tea, by domin- | halucinations, personal mag- muslo that som: surprising and joes, by marka, scars, or moles, mis- | netiem, thought transference, s resembles a flute. There startling. With it {cellaneons games with carde, lucky | etc. Written Ta lain, everyday E paama kear od autovia | yon oan we mhay tnopvariy as boom of HRS, ostaa mopa zeara: Powie | fanegaeg es anI Be p cena a; n: enj ve oracles reams, fin B Fou oan play end easa, | your Angore, the lead in a isad ponch, the tn nail observations, ete. PRICE fc | © p JOHNSON SMITH & CO. Aar Meson, Joor 3 for 28e, — JOHNSON SMITH & CO. ie TELLING’ BY CARDS wn Fortune With the aid of — thisdream book : and fortune- Thisremarkable book talls how. Explains all about Hypno- tism, how to RACINE, WIS. with cards, dice, dominoes, crystal, etc, Tells the meaning and sig- A copy of our NEW CATALOG mailed on receipt of 10c, or the De 4 Luxe Edition with cioth binding 25c. Bigger Gnd better than ever, nification of every card. Several dif- Only book of Its kindin eaistence. Contains thousands ofalithe latest tricks in magic, the newest novelties, puzzles, games, sporting goods, rubber stamps, unusual and interesting books, curositi ferent methods explaized and fully illustrated. Crammed full from cov- er to cover with complete informa- tion on fortune-telling. PRICE 100 Se LVILEEER in seeds and plants, etc., unprocurable elsewhere. Remit Coin, b CO. Money Order, Check or unused U. S. Postage Stamps, for all artis 4 S WerCtTeiim cies Ilsted above. Canadian money, stamps and Postai Notes postpaid, Stamps accepted, f accepted at current rate of Exchange. Address orders for all goods on above andon following page to JOHNSON SMITH & CO., Dept. 719, Racine, Wis. 30 Thank You for Mentioning Modern Mechanix and Inventions jor August When W riting to Advertisers T TURTLES BLANK CARTRIDGE PISTOL :Sent by Mail for Only ‘Three new models now out m n 25c, 50c and $1.00. Well A Fascinating |made and effective. Mod- x elled on pattern of latest and type of Revolver. Appear- . F > ance alone enough to scare a burglar. Takes 22 Cal. 1 Interesting Pet Blank Cartridges obtainable eren When Cal, p If you want a fascinating and interesting little pet, just risk a quarter and we [protection against burglars, tramps, dogs. Have it § will send you a real live PET TURTLE by mail postpaid to any part of the |lying around without the danger attached to other é U.S.A. Now all the rage. ‘Thousands upon thousands of these Turtles were |Fevolvers. Fine for 4th July, New Years, for stage It sold at the World’s Fair in Chicago. No trouble at all to keep. Just give it |work,-starting pistol, ete. SMALL SIZE 4 in. tong a little lettuce or cabbage or let it seek -its own food. They are extremely |25¢- MEDIUM SIZE Sin. long 50c. LARGE SIZE & gentle, easily kept and live for years and years. Needs less atiention than any |Sin. long $1.00. BLANK CARTRIDGES 50c per other pet. Get one or two. Study their habits. You will find them intensely |190- HOLSTER (Cowboy type) SOc. Shipped by Express ony interesting, ONLY 25c each sent by mall. Special Turtle Food 10e package not prepaid. 710 page catalog of other pistols, Sporting goods, etc. 100° Sateresting. ONLY 25¢ each sent by mall. Special Turtle Food 10e package Electric Telegraph Set | FRENCH PHOTO RING - 2 Pipi ee Here is a very great novelty BOYS! A private Electric Telegraph Set of your in Rings, that ia selling in © ownfor15e. Lots of fun sending messages Cc thousands, It is a nicely to your friends. Better still get two sets, hook them up madering, dnashedin (mitar es shown in the directions, for TWO-WAY MES- a dareo: imitation: diamond. SAGES (sending and receiving). No trouble at all M Ii looks just like an ordi- to operate with the simple instructions that ac- nary ring, but in the shank company each set. Operates on any of the ring is a small micro- estandard dry battery obtainable every- scopic picture almost invisi- where. With this outfit you can learn to ble to the naked eye, yet is transmit and receive messages by magnified to an almost in- the Morse International Code, and in a very short:time become an ex- pert operator. Mounted on wooden credible degree and with as- tonishing clearness. There 4s quite: ań ass sortment of pictures that should suit all tastes, De . 5 Some are pictures of bathing girl beauties, ase measuring 4 x3 in., first class pretty French Actresses, etc., others are views construction throughout, complete with key, sounder, magnet, min- iature Western Union blanks, ‘packed in neat-box, with full of places of interest in France, Panama Canal and elsewhere; ‘ others show the Lord’s Prayer in type, every word of which can be read by persons with normal eyesight. They are inter- esting without being in any way objectionable.. PRICE 25¢, 3 ulustrated instructions — ALL FOR 15c (without battery). postpaid (Canadaand Foreign 200.) for 65c, or $2.25 per doz. postpald. 7/0 page Catalog 10e. 710 page catalog of novelties, jokes, Aaa ts ef see ec | CHAMELEONS—Shipped by Mail—25c for boys. Tella how tomake batteriea,dy- WATCH IT CHANGE ITS COLOR namos, motora, radios, tricks, puzzlios telegraph. apparatus, aare Me a cal. Nees e r mee aiaee Dert:719, Racino, Wis. = e engine, PRICE 100ppd. - LIVE DELIVERY GUARANTEED Get one of these most wonderful of all creatures. Watch it change its color. Study its habits. Wear one on the lapel of your coat as a curiosity. Watch it shoot out its tongue as iL catches flies and insecls for food. No trouble to keep. Can go for months without food. Measures about 4 inches in. length. Shipped to any address in U. S. A. by mail. We guarantee safe arrival and live delivery. PRICE 25c, 3 for 50c, POSTPAID. Subscribe to our Monthly Magazine FUN, MAGIC AND MYSTERY oF |] We also publish a monthly, Magazine of NEW J VAMPING deel ER CARD NO TEACHER NEEDED--SURPRISINGLY SIMPLE SYSTEM ‘Persons having neglected their Musical Education need not despair, for with the aid of our new VAMPING CARD (placing the card upright over the piano keys), you can Vamp away to thousands of Songs, Ballads, Waltzes, Rag Time, etc., etc. No knowledge of music is required. After using it a few times, you will be able to dispense with the aid of the Vamping Card entirely, The prico of this very clever invention is only {50 postpaid. BIG ENTERTAINER i FUN, MAGIC AND MYSTERY. Each "ANDMNS f| issue contains a big collection of parlor = magic, tricks with cards, fortune-telling, funny readings, amusing experiments, money-making secrets, jokes, riddles, conundrums, parlor amusements, puzzles, roblems, science, mechanics, etc. In add- ition it will list all the latest novelties, tricks, puzzles, etc. Because itis really a } magazine and catalog combined, we have 7 fixed the subscription price at ONLY 10c per year, or 3 years for 25c. This as you readily see does not even cover our mailing expenses, let alone the cost of getting up the magazine. Try this magazine for one year. 7 FUN, MAGIC and MYSTERY £26 Jokes and Riddles, 25 Magie Tricks, io Parlor Games, 73 Toasts, 18 Fairy ales, 105 Money-making Secrets, 22 p onofogues, 21 Puzzles and Problems, Comic Recitations, 10 Funny Readings 1) Parlor Pastimes, 18 Flirtations, 1116 irla and Boys Names and their Mean- ngs, 10 Picture Puzzles, 69 Amusing z; - RE ymes, 37 Amusing Experiments, Deaf and Dumb Alphabet, Shadowgraphy, ypəy Fortune Teller, How to tell Fortunes with Cards, Dice, Dominoes, Crystal, 'Co: ‘ee Cup, ete., Hypnotism, Ventriloquism, Cut-outs for Checkers and Chess, minoes, Fox and Geese, 9 Men Morris, Spanish Prison Puzzle, Game of Ana- ms, 25 Card Tricks, Crystal Gazing etc. ALL FOR 15 CENTS POSTPAID UMammoth 710 page Catalog of novelties, jokes, tricks, puzzles, etc., 10 Cents. aa JOHNSON SMITH & CO. (VALEE Dept. 719 RACINE, WIS. CATALOG A copy ot our NEW CATALOG mailed on receipt of 10c, or the De x Luxe Edition with cloth binding 25c. gger and better than‘ever. | Only book of its kindin existence. Contains thousands ofalithelatest nea a hee ot tricks In magic, the newest novelties, puzzles, games, sporting 4 goods, rubber stamps, unusual andinteresthg books, curlosities TUL ELDUE in seeds and plants, etc., unprocurable elsewhere. Remit by Co [Woe Money Order, Check or unused Ù. $. Postage Stamps, for all arti described with 56 pictures. Only 25c an Proteies cles listed above. Canadian money, stamps and Postal Note: t t accepted at curront rate of Exchange. . JohnsonSmithCo. Dep. 719 Racine Wis- Address orders for all goods on above and on previous page to JOHNSON SMITH & CO., Dept. 719, Racine, Wis. Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers 31 į Written by Td sharper. Tells how to win at drew How to Win at Witte "Explains diferent varieties of poher such 28 Berai ht Poker, Stud Poker, Whiskey Poker, Mietl- gris, The Freeze-out, The Widow, Buck, Jack-Pota, etc.’ Exposes the methods used by card sharpers and professional gamblers. 13 Chapters. This book con- tains a vast amount of information and may save yoo from being fleeced by crooked players and gamblers. PRICE 10c postpald. 710 page Novelty Catalog 100 How to Pitch Real Curves Pitch the Fade-a-way, Spitter, Knuckler, Smoke Ball, etc. Lessons by leading Big League Pitchers. Clearly illustrated and

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MY FLIGHT By * aes. Foo carn VER since the first stratosphere ascen- sion of my brother, Auguste Piccard, I have been asked these questions: “What about going still higher than the stratosphere? What about going beyond the carth’s atmosphere? What do you think of week-end trips to Mars or a sight-seeing flight through the rings of Saturn?” Eventually I believe it will be possible to circle the earth in two hours at an altitude where there is no air to interfere with one’s motions. However, as to interplanetary travel—well, let us begin at the beginning: It is strange to say, but half an hour from here there is something like an entirely new country. Stratosphere is the name given to it. It is the upper part of the earth’s atmos- phere, the region of eternal cold. It begins about six miles from the earth’s surface, and the air of which it is composed is too rarefied to sustain human life. So far, men have gone into the upper strat- osphere only by means of balloons. No bal- loon, no matter how great its buoyant pow- er, can go beyond the stratosphere, because a balloon is lifted by the surrounding air. However, there is another method of loco- motion which does not depend upon air— that is the rocket. The rocket supports it- self by throwing off the products of combus- tion. A simple calculation shows that a we! Photo shows take- off of Prof. Auguste Piccard on world’s first stratosphere flight. This scene will be . duplicated this summer in De- troit by the famous scientist’s brother, Jean, the author of this unusual story. Prof. Auguste Piccard is shown with an assistant inside the aluminum gondola of the balloon which carried him to a height of more than ten miles into the stratosphere. Prof. Piccard was the first to invade the stratosphere. 34 Modern Mechanix -and into the STRATOSPHERE Interplanetary Flight Y BREAKING down matter, transforming it into light and |} utilizing the resultant energy, man may make a round trip to Mercury (57,000,000 miles distant) on about 110 pounds of lead, according to news interviews with Prof. Auguste Piccard. Explosive fuels for interplanetary travel, however, offer difficulties. Moon-bound projectiles would re- quire an initial velocity of 24,000 m.p.h., fired from a gun barrel al- most 2,000 feet long. Moon rockets A would need 20 tons of explosive. To avoid a smash on landing, another 20 tons is necessary to brake. the rocket. 114,800 FT. (elgg MI} To be the first licensed woman balloonist and first of hee sex to enter the stratosphere, Mrs. Jeannette Piccard, wife of the author, is taking balloon lessons, preparatory to piloting her husband into space. Above, left to right, Mrs. Piccard, Professor Piccard and the instructor, Edward }. Hill, noted Detroit balloonist, on a recent trial flight. rocket can easily contain enough energy to go beyond the stratosphere, say 100 or 1,000 miles from the surface of the earth. The cal- culation also shows that from a purely ener- getic point of view, a rocket might contain enough fuel to leave the neighborhood of the earth altogether, and visit our most dis- tant sister-planets. Such a flight to another planet would be theoretically possible but exceedingly diffi: cult. Anda return flight would probably be impossible. In the present state, of- oue knowledge, it is useless even to discuss in- terplanetary travel as a practical. thing. New sources of energy will first have to be tapped—sources related to the vast energy given off by radium aad other radio-active substances. Physicists have just begun, less than a year ago, to create artificially, minute amounts of radio-active substances. If one could produce large amounts of these sub- stances—say, put them on the market in lots of half an ounce—then it would be time to talk- about interplanetary travel. It is Faoz OF AIR MASS (FEMPERATURE BELOW ‘THIS POINT DECREASES AS. Man’ s ‘cBniiest of space and the hardships he must adas ate graphically shown in drawing above. Greatest height reached was: that of projec Note how air ‘mass grows Inventions . for August 35

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Flaming dynamite and exploding mortars are the chief tools of the fireworks expert. In this vivid, intimate story one of the aces of the fireworks army takes you behind the scenes to reveal, for the first time, the thrills and dangers of his roaring trade. ; pa y PAUL PADDOCK MIOS of Americans thrill yearly to the glittering wheels, flaming rockets and spectacular bombs of the giant fire- works displays; but the men who fire them are the men nobody knows—the world’s ‘most mysterious showmen. How does it feel to walk among the flaming sets and exploding mortars during a big display? What are the real dangers of this roaring trade? What is the strange, unexplainable lure of a profession that re- quires toying with tons of explosives to give the crowds a flaming thrill? Art Briese, for nineteen years an expert pyrotechnician for Thearle-Duffield, re- cently revealed the mysteries of his calling to an investigator for MopenN MECHANIX ‘AND INVENTIONS. Briese has personally blown millions of dollars worth of fire- works into blazing ruins; he’s touched off ‘enough powder and dynamite to blow Pike’s Peak into fragments; and he’s come through his. exacting job with injuries no more se- rious than scofched:hands.and a current-én- 40 TIME FUSE IGNITED = BY LIFTING POWDER - LIFTING POWDER POWDER EXPLODED —— me BY TIME FUSE STARS CAP BLOWS OFF 5 AT TOP OF FLIGHT Top drawing shows cross section of giant rocket that dis- charges star showers., Below is mortar and bomb which is divided into sections holding the different colored stars. thusiasm for his work that’s as keen as the day he got his first stick of dynamite to bore. “One of the important things to keep in mind about fireworks,” said Briese, “is the difference between display work and. the over-the-counter business—that is, the sale of firecrackers, pin wheels, rockets and the Jike to the consumer. Accidents are far less frequent in display work because trained men do. the firing. “The noise-makers are.the most danger- ‘ous“ pieces. .:In fact, a stick of dynamite is : about. the most hazardous unit we emplay. Modern: Mechanix. and Oe ee we ay gen i i à Of course, when this is handled properly, it’s safe. “We don’t use much dynamite in the aver- age show. At the Century of Progress, for instance, it is forbidden because the shock would be harmful to fish in the Shedd Aquarium, In shows where dynamite is used the sticks are fired electrically. They are suspended a few feet above the ground and carefully isolated to prevent damage. These shots and the big bombs we call ‘ballyhoo.’ The bombs are fired from mor- tars, steel cylinders buried up to their necks in the ground. Workers are protected by a barricade consisting of a 12” x 12” timber or a telephone pole to prevent danger in case a bomb is detonated in the mortar. The firing fuse lies out over the barricade where it can be ignited easily without get- ting too near the mortar. This fuse ignites a charge of powder at the base of the bomb, literally pushing it into the air. The explo- sion comes when a time fuse, already ignited, reaches the powder charge. Guarding Against Accidents “The worst accidents in the fireworks business occur at the factories but they are rare now. Only small quantities of material are handled at a time and most of the work is done in isolated sheds, spotted over a wide area. These sheds are of flimsy con- struction. If an explosion does occur, the Top photo shows workman fashioning rattan outline of Barney Google for fireworks set piece above. At right is attist’s drawing of Fort Mce- Henry which workmen fol- low in placing rattan and fire lances on 5x10 foot frames covering 1000 square feet. Inventions for August 41

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AMERICA’S NATIONAL ‘CHAMPION REVEALS There are many fine tricks—from proper carburetor adjustment to selection of chains —that have enabled me to ride to several championships. In my shop at Glendale, California, I prepare my equipment for summer events, but only after many experi- ments do I decide on the exact equipment and method of riding to use on a particular hill. Unhappy and.sometimes painful con- sequences result from using improper equipment. If the motor does not loop when a rider pours on the power, it may jackknife, caus- ing him to catch a heel in the chain. Only skill as the motor jumps over rocks and digs its way down into soft spots can keep the machine on the straightaway and out of the crowd. Mechanical Aids to Victory I do not count so much on my skill to bring me through to a victory as I do upon three mechanical factors: carburetor’ set- ting, proper gear ratio and chains on the rear wheel. In no form of racing does vic- tory depend more on how we use our fuel and how the machine responds to the con- trols. The slightest variation in the fuel supply makes a tremendous difference in the sen- sitive motor. If I want to hurdle a ditch, J pour it on and take all the speed and drive I can get; on the other hand, if the front wheel shows a tendency to leave the ground or if the chains are biting down into soft dirt, I retard the throttle a little. The proper fuel combination is highly important. I have found a mixture of three- fourths alcohol and one-fourth benzol gives the greatest power and pick-up. The high speed carburetor adjustment is likewise important, requiring one full turn on the needle beyond the setting for gasoline to make the mixture rich enough. Alcohol- benzol is heavier than gas. You can have a lot of sport riding your own motor up neighborhood hills, but if you want to get the best from your engine it will be a good idea to keep a record of all carburetor adjustments and the results in speed and power from each setting. From this you will learn how to handle your own motor. I always take this precaution. Generally speaking, you should retard the spark and cut down on the high speed valve until the motor sneezes. -Then come back on the valve until the motor will just take acceleration. With advanced spark the motor should be basically right, although you will need to make additional adjust- ments to suit conditions and: your individ- ual style of riding. Do not underestimate the importance of chains. In my supply are two kinds. One is a Weed chain with loose overlapping links of the same type; the other is motorcycle chain with loose overlap- ping links of Weed. The first is best and Modern Mechanix THE THRILLS AND SPILLS OF HILLCLIMBING i Hillclimbing Facts ‘Weight of motorcycle—316 ibs. Piston displacement—45 cubic in. Speed of the motor—6,000 r. p.m. ‘Crankcase lubrication—castor cil. Fuel—alcohol, 34; benzol, 1%. Length of hills—100 to 600 feet. Length of the take-off—25 feet. Steepness of grades—-50 to 80%. Taking off from a level start never more than 25 feet in length, hillclimbers must hurdle ditches, scale rocky ledges and keep. their mounts level on an 80 per cent grade. Photos show how last-second disaster often cheats the rider. adapted to the soft or sandy hill and the latter seems best suited for a hard surface. More than once I have beaten a rival be- cause he used the wrong type chain. Had my competitor done as I did—tried out both kinds on all types of hills—he might have.fared better. ~- In the west I use the motorcycle-Weed combination, generally speaking, while I usually! equip with Weed only in the east. The Muskegon, ‘Michigan, hill illustrates the need’ for -all-Weed. This is a rather sandy climb. In ‘practice rides last year I found the sharp edges of the motorcycle chain dug a grave for the rear wheel and left me standing near the foot of the hill. When I changed to the other type, the loose links piled up on the tight links, giving me nearly an inch of projecting chain to better my traction which enabled me to climb easily to the top. ` »Selection of a proper gear ratio is one of the secrets`of successful hill climbing. If you have too low, a gear your motor may :. leap out from ‘ufider you; if: you have too high a gear your motor will stall.” In the (Continued on page 120). ~ thnventions ‘for -Awgust 47

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‘Problems of STAGING a (Championship Bight ALFRED ALBELLT ADISON Square Garden’s Long Island Bowl in New York, scene of the Primo Carnera-Max Baer heavyweight champion- ship fight, is a triumph for the science of outdoor sport dramatics, Behind the scenes of this world’s championship match are the latest mechanical marvels and an or- ganization of showmanship, surpassing all previous open-air spectacles in the boxing business even in the days of the great Tex Rickard. Engineering geniuses of the Madison Square Garden Corporation, headed by Lionel Levy, famous architect of the Long Island Bowl, made improvements in the bowl after a careful survey of conditions Putting on a big fight for throngs of 72,000 and the anxious outside world calls upon all the ingenuity of showman- ship. How Madison Square Garden, of New York, does it is described here. during the Jimmy McLarnin-Barney Ross welterweight championship fight in May. The technicians regarded the prior show as “a dress rehearsal,” and all details of lighting, seating, vision, and safety were checked over with penetrating caution, to _insure the success of the heavyweight title fight. The lighting effects are under the direction of Frank Niskern, an engineer formerly with the General Electric Company, but enticed into the outdoor enter- tainment business by Madison Square Garden. It was Niskern who improved lighting arrange- ments after ringside sports writ- ers protested that the heat from scorching ring lights made their work unbearable. At left is a closeup of the ring under cou struction. Forty-five 1,000-watt lights ace hung in the framework to which is also at» tacked batteries of megaphone loudspeakers, vi Looking down from the bleachers to the. rim the two elevated platforms for newspapet and’ newsreel caniéramen ate plainly visible. Because of the 1,000-watt Tights sports writers seated at the ringside suffered from intense’ heat. iy 30- Modern Mechanix and A staff of more than 1,500 is needed to control throngs of 60,000 to 72,000 persons attending the big fights. Here is an air view as crowds, filled the Long Island Bowl for the Jimmy. McLarnin-Barney Ross welterweight match. Forty-five 1,000 watt electric lights were suspended 15 feet over the ring during the McLarnin-Ross fight. Before the heavy- weight fight Architect Levy summoned pho- tographers and newspaper reporters to the Madison Square Garden Bow! and they were directed to assume their places. The cam- eras were placed on stands 25 fect from the ring. : These stands are steel towers, elevat- ed above the ringside seats. After considerable experimenting, Levy and the photographers agreed that’a height of 22 feet-was practical and saved.the news- paper men from scorching heat. The engineers then checked up on the Joud-speaker system. Four highly sensitive -microphones were suspended 15 feet over the center of the ring and connécted to loudspéakers posted at the four corners of the framework holding the lights. An électrical network in turn reproduced announcements by means of amplifiers scat- tered throughout the arena. The outside world was not forgotten by the Madison Square Garden Corporation. Telegraph keys were posted beside each reporter’s seat so that sportswriter and telegraph operator could work rapidly without interruption. Special telephones were installed, contacting the reporter at Inventions for August i Problems that came up during the McLarnin-Ross fight were solved before Primo Carnera (left) and’ Max Baer met for their heavyweight championship battle in the big bowl. the ringside with his distant newspaper editorial room. Another innovation was the telephone system from the ringside to the dressing- rooms where opponents and their handiers were notified when their bout was to go on. By a re-arrangement of the seating plan, so that only one inch was subtracted from the space between rows, Levy was success- ful in increasing the seating capacity from (Continued on page 121)

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Above—The beach at Cocos Island, goal of the treasure seekers;: showing rude. shack left by other expeditions. Right-—~A radio metal. finder, similar in principle to that used. by: the: English gold hunters. A change in the radio -tone signal indicates the presence of buried metal. ANSWERING the challenge of ghostly buc- caneers, an English expedition, armed to the teeth with modern scientific equip- ment, is preparing to lift the world’s great- est treasure hoard—the pirate gold of Cocos Island. Lying in the upper reaches of the South Pacific, about 500 miles south by west from Panama, Cocos Island has been the peren- nial goal of treasure seekers ever since the bloody days when pirates roved the tropic waters and hid their booty on the famous isle. ` Hundreds of tons of gold and silver bul- lion lie buried in the jungle depths of Cocos Island—in fact, well founded estimates place the total value of the long-lost hoard as high. as $60,000,000. This.is the treasure which the English expedition hopes to find after countless others have failed. i Headed by Commander F. A. Worsley, Captain of Shackleton’s Eudurance in the Antarctic Expedition of 1914-16 and sailing master of Shackleton’s Quest in 1921, the English group is basing their hopes of dis- covering thé treasure upon the use of a new scientific machine embodying radio-elec- tric principles. An electric field is set up on the surface of the earth by means of electrodes connected by wires to:a port- ableibattery case and a ratiometer mounted on a tripod. These electrodes are moved about to form a rectangular “grid.” Any 54 ‘Radio CHHUNTERS SEEK re fpe i conductor of electricity lying underground —and gold and silver are among the best conductors known—will show a disturb- ance in the regularity of this grid easily detected through headphones worn by the operator. Once the presence of the precious (Continued on page 134) Modern Mechanix and “PIRATE GOLD PE GeerRE ROAD ACROSS ISTHMUS Yreasure lies north of dotted line > PS ROUTE OF PACIFIC es PLATE, FLEET The graphic map above plainly shows why Cocos and its surrounding territory are such rich grounds for the treasure seekers. Spanish ships once sailed from Manila to Acapulco, Mexico, with cargoes valued at $10,000,000. Other galleons, laden with gold and silver, sailed from Arica and Callao to Panama, where shipments were transported across the Gold Road to Porto Bello. Some of these ships were driven on the reefs by storms where their cargoes were lost, Others fell into the hands of Drake, Morgan and Cavendish, who looted them and butied their treasure. Likewise, the Spanish ships plying the West Indies were waylaid by Captain Kidd, Lafitte and Blackbeard. Much of their plunder is reported still buried in Cuba, Haiti, Tortuga, Jamaica and St. Kitts. The isle of Trinidad presumably bides another pirate hoard. Inventions for August 55

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ARE YOU FIT to DRIVE a Modern cars have become engines of destruction in hands of unsafe drivers. Here is the story of what science is doing to rate drivers’ abilities and make streets and highways safe. Left—Seated at the wheel of a dummy automobile, a subject is taking an ail- around driving test, as be faces the miniature stage shown below. Across the front of the stage, a toy car is suspended from an iron bar. The- controls of the car in which the driver sits operate the toy car, moving it to left or right as the floor of the stage moves on an endless belt, to simulate passing road conditions. Driver’s task is to guide the toy cer as if in actual traffic. by JOHN C. HARPER HIRTY thousand people—one every fif- teen minutes—-were killed by automo- biles in the United States last year. During the same period 850,000 others, were injured—an amazing average of one casualty every thirty seconds of the entire year. In the hands of the unsafe driver, the modern automobile has become a terrible engine of potential destruction. Speeds: of 80 and 90 miles an hour are virtually stand- ard in all present cars; yet a speed only slightly higher—i00 miles an hour—was condemned last year by the rules committee of the Indianapolis Speedway as having “gone beyond the physical limitations of the track for safe driving.” Unsafe Drivers Menace Public Yet despite mounting casualty lists and high speed warnings men and women unfit to drive continue to roar down the high- ways headed for disaster. Some of these drivers cannot tell red from green; others see two cars where there is only one; still others become panicky and “freeze” when confronted with an emergency. To halt this senseless slaughter and stem the casualty flood, Dr. Alvah R. Lauer, asso- ciate professor of psychology at Iowa State College, has recently perfected a series of tests which determine, with remarkable ac- curacy, the limits of a motorist’s driving ability. Dr. Lauer’s experiments cover every pos- sible contingency. His “driving dozen” ro 20 tests the motorist’s field of vision, depth per- ception, ocular dominance, glare resistance, color blindness, length of vision, strength of grip, speed of movement, reaction to noise, motor control, nervousness and gen- eral manipulation. In forty minutes he can find out as much about the subject’s ability to operate an automobile safely. as might be revealed in several years’ actual driving. There is the matter of field of vision, for example. A driver with normal sight may look through the windshield and yet, with- out changing the focus of his eyes, detect moving objects at either side. This gives him a total field of about 190 degrees, a margin of safety permitting him to watch crossroads and passing drivers. Other mo- torists, however, have an extremely narrow field, known as “tunnel vision.” They see only as much as the normal person might if he were looking through a length of pipe. Modern Mechanix and AN AUTOMOBILE Picture No. 1 shows an examiner at a galvanometer testing the driver shown in Picture No. 2 for nervous stability. Driver has both hands on electrical contacts as an elec- tric current passes through his body. His reactions to the sudden sounding of an auto horn are recorded by examiner. Picture No. 3—Dr. Lauer, left, gives driver a field of vision test. Right, subject uses stereoscope to de- termine depth, or distance percep- tion, No. 4—The “glareometer”’ test. No. 5——Driver’s eyes are being tested for nearsightedness, farsightedness or blurred vis- ion. No. 6—Motorist taps telegraph key as rapidly as possible to determine speed of movement. No. 7— Examiner tests the driver for color blindness. A device for testing strength of grip is shown lying on the table. Dr. Lauer tests the field by placing a large cardboard protractor in a horizontal posi- tion in front of the driver’s eyes with the center of the flat edge at the bridge of the nose. While the driver’s gaze is focused straight ahead, a pencil is moved along the curved edge of the protractor from front to back until it passes out of the driver’s sight. The points of disappearance on ei- ther side give the measurement of the field. The reader can test his own field of vision in arough way by focusing his eyes on some object directly in front of him and wiggling his fingers at each side of his head. If he can see them when they are well to the side, he can be reasonably sure that his field is about normal. Dr. Lauer’s tests have shown (Continued on page 121) Inventions for August 59

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ill “Black BLIZZARDS” MAL DAY (200: PARTICLES PER CUBIC INCH EARTH INVISIBLE - Above are some unusual statistics gathered during the dust storm by the weather bureau. The dust was so thick it drifted into homes through closed windows and in some cases forced cancellation of schedules of transport airliners. Dust storms catried away 300,000,000 tons of soil from fertile farms of the Middle West. Drifting sands that remain threaten to de- stroy this region. Here is a startling story about a storm that cost $2,000,000 a day. At left can be seen a huge drift of dust that almost covered farm machinery. Ia some cases the dust drifts were 20 ft. deep. by James Nevin Miller IGANTIC dust storms sweeping across the United States like “black blizzards” threaten to convert the fertile Middle West into a desert as arid as the Sahara. In a few days 300,000,000 tons of dust, once fertile soil in regions west of the Mississippi, were whipped into the air by strong gales. The vast cloud, so black and somber that the sun was hidden, had a front 900 miles wide. It originated in the sandy country of Montana, and picked up more soil as it swept over the Dakotas, Minnesota and other midwestern states. The “black blizzard,” two miles high, continued on across the United States drop- ping its load gradually as it moved out over the Atlantic. The storm was a devastating climax to a 28 day drought. Wheat farmers in the fer- tile Great Plains areas lost an estimated $2,000,000 a day as vegetation burned. Countless cattle in parched fields sickened and died as dust blanketed pastures. In- This exceptional view, taken by a weather bureau photographer, shows the dust storm sweeping down on a city in the Middle West. The cloud was 900 miles wide and moved 1,800 miles across the U. S. and on into the Atlantic ocean. 64 Modern Mechanix and MAKE U.S. The “Black Blizzard” engulfing a midwestern city is strik- ingly shown here. The. cloud completely shrouded the sun forcing automobile drivers to abandon their machines. numerable young plants, notably:-wheat and corn, were literally blown from their base, causing severe crop: damage. The storm, Dr. W. J. Humphreys, of the Washington Weather Bureau, said, origi- nated in the bare land of the Great Plains states that had been pulverized by culti- vation and dried by severe drought. Violent gales swept this powdery soil up in a huge cloud. -Experts point out that man’s attempts to cultivate dry lands in the far west threaten to convert the states west of the Mississippi into a vast desert. Formerly the loose soil and sand was held in place by wild grasses. Plowing under of this grass exposed the light earth to the constant winds. The erosion is becoming so severe it is feared ‘that within a few years the poor soil that remains will not support any type of vegetation. Investigation shows that the wind carries away the light, fertile soil, leaving the coarser sand to drift across the land.’ This sandy: soil will not hold water and unless steps are taken there is danger that the vast region will become a desert. Recent discoveries indicate that the Sa- hara was once a fertile country. Whether it was doomed to be an arid desert by dust storms is not definitely known, but records show that Europe has been swept for cen- turies by “black blizzards” originating in the Sahara. Inventions for August a DESERT? Above: A wea- ther bureau pilot ready to take off to get dust samples, Irving F. Hand, U., S. Weather Bureau aerial observer, is shown examining dust which he collected in his suction instrument. It showed 25,000 times more dust in the air. The dust particles were found to be twice the usual size. 65

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ow (2ARNIVAL ‘Racketeers al Eager crowds, like that above, throng the carnivals and side- shows, squandering dimes and quarters on devices whose odds are fixed in favor of the operator. Right, a percentage wheel, in which the winning numbers are predetermined by a series of gears in the hub. Carnival confederates, knowing the various sequences, cover these numbers and walk off with the prizes. by EARL CHAPIN oe of dollars are taken from the public by clever operators of the smaller sideshows and carnivals who have capitalized upon the American love for games of chance. ; Cries of “Try your luck” still meet with ready Tesponse despite the fact that one might as well back a three-legged borse to win the Derby as to buck the carnival games and gyp wheels. But the gullible bystander persists. He believes that luck and the law of averages has something to do with it—and be’s right; but the luck is all with the operator. The player doesn’t stand a chance. He can’t win because the games are set against him. The Mechanism of the Ball and Tenpin Game A good example of the mechanical ingenuity be- hind some of the devices used to fleece a customer is afforded by the familiar “Ball and Tenpin” game. A ball, suspended by a chain from a gibbet-like cross-arm, swings in an arc on a level that permits it to bowl over a tenpin set in a notch on the plat- form below. The player must release the ball in such a manner that it passes the pin going out, but bowls it over on the back swing. When the operator demonstrates the trick it looks amazingly simple; but, try as he will, the player cannot duplicate the performance. The secret lies in the fact that the tenpin isn’t where it was when the operator was demonstrating a moment before.. Not even the man who invented the trick could beat his own game now. By a simple mechanical adjustment the notch in which the tenpin rests may move, the entire board may move or the arc of the swinging ball may be changed. Another carnival racket which has proven a 72 Clever sharpers rob the public of vast sums in catni- val games. This story reveals their secrets. RSR TOK ER WHEN crier PIN OV GUIDE BLOCK ORC ARM 1S SHIFTED ONE SERTE? BRIS MOVABLE BACK PIECE CONTROL= LED BY LEVER Above, three games which the player cannot teat. Diagram shows how tenpin game works. Weighted brick in pyramid cannot be knocked frem counter. A lever locks the eat in place. Modern Mechanix and = BOTTLE WITH HLEECE the ‘PUBLIC From the G-Wheel swindles to the bucket concessions, the odds are stacked against the bystand- et or “customer.” CONTROL ROD “BANJO BEAD" WIT TONE RIN ; BALL ERR R ; TRANSMIT THRU: ae EIGHTEEN Bango FALSE BOTTOM SHIFTS TO MAKE BUCKET SHALLOW OR DEEP CANVAS MILK ; METAL TUBE i HALF FULL OF i . MERCURY. g Above, control rods tighten the bucket bottom, making the balls bounce out. Right, mercury in milk bottle is shifted at will. When at bot- tom, the player cannot knock the bottle over. Inventions for August One of the biggest money-makers on the lot is the G-Wheei (“Gyp Wheel”). Players rely on its honesty because all working parts are apparently open to inspection. The solid framework is bolted to the counter with screws. A metal arrow centers on a spindle which rests on a piece of glass laid on the counter, But the board on which the glass rests is movable. The board drops, the spindle runs free and the arrow may be stopped at any point by a clever operator without detection from crowd. veritable mint to its operators is the familiar “bucket shop.” In this game the player’s problem is to toss three bails into a shallow, tilted bucket, in such a manner that the balls will not bounce out over the rim again, but instead roll out of the round hole on the downward side. While the operator drops the balls into the bucket with consummate ease, the player invariably tosses one ball a little too hard and it bounces out again. If the player scents trickery and protests, the opera- . tor may even take his bucket out onto the fairway and prove to his customer that he can still make his balls stay put. Convinced, the customer tries again, but with no more success than before. Of course he can’t win! The bucket has a false bottom which either permits or precludes the pos- sibility of making a successful toss by the simple turn of a confederate’s wrist. - Why the Balls Bounce From the Bucket The bucket may have either a “banjo head” bot- tom, or one which moves up or down, causing the receptacle either to be deep or shallow. The “banjo head” bottom is made of pliable material which is made taut or lax by the pressure of a circular piece of steel which acts in the same manner as the tone ring in expensive banjos. When the bottom is at its maximum springiness, the ball will bounce out no matter how easily it may be tossed. The operator communicates with his confederate by means of word signals included in his conver- sation with onlookers. The accomplice may be be- hind a curtain within the stand, or in a control room near by. Usually it is the latter case, for this arrangement avoids detection. (Continued on page 124)

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In field of trans- portation, air liners, Burling- ton “Zephyr” train, modern motor cars, and new Union Pa- cific train set new records for Diesel power. Italy’s . Augustus, largest motorship in the world, has trav- eled for years un- der Diesel power. This Sterling crankless Diesel is designed chiefly for small marine craft. Direct-drive engine has low weight, high speed, and large power of gasoline engine. Cylinders are horizontal, permitting much [ower engine construction. Low center of gravity makes engine ideal for war tanks, for powering gun catriagés, and for autos, As in most Diesels compressed air in small pressure tank is used for starting. 80 Speeding over high- ways and above them, over oceans and under them, 1934 Diesel en- gine heralds dawn of a new era in transporta- tion, in power genera- tion, and in industry. by ROBERT FAHERTY Tee Diesel era is arriving! Under high compression and with swift, sure strokes the Diesel engine is pounding its way into all corners of the world, bringing new speed and power to industry and to transporta- tion. The lowly “rational heat motor” patented by Dr. Rudolf Diesel in 1892, and consid- ered an outlaw among engines for almost a score of years afterward, has today be- come a multitude of different Diesel types, all revolutionizing their respective fields in industry. “The Diesel has got to come,” says Henry Ford, as he experiments in his Fort Myers, Florida, workshop with some new idea for a Diesel engine. “I do not know or care in just what shape, but it is our business to find out.” Early Diesel engines were crude and bulky, suited only for stationary: installa- tions in power plants or perhaps on large ships. Modern engineering research has developed this first oil engine with swift progress to the point where, today, the Diesel engine is breaking new speed and power records on every hand. The Diesel is an internal combustion en- gine without spark plugs. Air is compressed Modern Mechanix and Conventional Diesel engine pictured at right is harnessed in many ways to supply power needs of industry. Power shovels, huge motor trucks, freight locomotives, and cross- country busses all herald the dawn of the Diesel era. New starter equipment permits Diesels to be used anywhere. in the cylinders to pressures of from 375 to 600 pounds per square inch. So great is this compression that the air inside is heated to over 500 degrees Fahrenheit. Fuel oil sprayed into this heated air immediately explodes. The easy ignition makes possible the use of crude oil or other cheap oil refining residues. Larger Diesels can operate on cruder oil than can the light, high-speed Diesels used for transportation purposes. The cost of fuel therefore varies, but it is always less than that of kerosene or gasoline. Railroads Use Diesels The Diesel engine is now coming into its own in the field of transportation. Rail- roads are putting out high speed, Diesel- powered trains with latest of modern con- veniences in a determined attempt to regain iraffic lost to the busses and to automobiles. The Burlington “Zephyr,” an ultra- modern and stream-lined three-car train, depends on an 8-cylinder, 600-h.p. oil-burn- ing Diesel for its absolutely safe cruising speed of over 100 miles an hour, The second of Union Pacific’s “Trains of Tomorrow,” now being completed, will use a 12-cylinder V-type Diesel. The first of these trains, though powered with a 600 h.p. distillate-burning engine, has already set new records for speed and economy of operation in its exhibition tours of the country. With Diesel power the train can carry enough fuel for a 1,200-mile run. An ordinary steam locomotive must re-coal every 100 miles. . A small Diesel in the new streamlined railear of the Great Western Railway in England gives almost entirely automatic (Continued on page 120) Inventions for August rot magerion Top diagram shows relative positions of opposed pistons and tilted discs of new Sterling crankless Diesel, As many as six cylinders may be grouped around disc, Special bearings convert back and forth motion of pistons into rotary motion of drive shafts at each end of engine. Below: Arrangement of intake and exhaust manifolds is simple. 81

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RTIFICIAL lures have become so popu- lar that they have practically replaced live bait with sportsmen. These plugs, bugs, flies and spoons have increased in num- bers so greatly that there literally are thou- sands on the market. Indeed each of these lures has some merit and in most cases proves more killing than many a live bait. The fisherman now has hundreds of patterns from which to choose and without a doubt can find a lure to resemble any of the live types. Lures Should Imitate Live Bait Sportsmen who claim that this or that lure is useless in tempting game fish often are mistaken. Usually the difficulty lies not with the lure, but with the fisherman’s man- ner of handling it. It must be remembered that.a lure usual- ly is intended to imitate some form of life sought as food by fish. To properly use such a lure, therefore, the fisherman must, as nearly as possible, imitate the actions of the artificial bug, fly, minnow, or animal he is using so as to completely fool the wary denizens of the streams and lakes. Artificial bait is either of the underwater or floating type. So popular has the latter become that the fly rod is rapidly gaining A few of the popular lifelike lures are shown. above. There are a great variety of others that are equally effective for hooking game fish, All types of life eaten as. food by fish are being imitated. -The sizes vary for different fish. 86 by Robert Page Lincoln on the bait casting rod as the favorite of sportsmen everywhere. For the fly rod there are a host of imitation bugs, flies and other types of life, found near the waters, from which to make a selection. To properly use the different kinds of bass bugs one should cast to a likely spot. Permit the floating bug to remain motion- j Modern Mechanix and Hundreds of lures are available to the fisherman. The problem is to use and select them effectively. An ace of anglers here tells you just how to get good results with artificial bait. less for a few moments on the water. This will give the bass, who may have noted the drop of the lure, time to inspect it. No strike occurring, move the bug forward a few inches. If the bass fails to dart at it, again let the bug remain motionless when he may seize it. Repeat the procedure a third time. If it fails, cast to another spot. The writer has found this one of the most successful ways of using the bass bug. When to Set Hook for Bass Select your lure to correspond with the type of insect found on the water and the time of day you,are fishing. In the evening, when bass feed heavily, pick the night rovers of the air, such as grasshoppers, beetles, moths and dragon flies. Lifelike imitations of all-of these can be found in any sporting goods house. Deep pools close to shore are favorite locations for casting your floating lure in the evening. At that time all manner of life moves to the water’s edge, including frogs, mice and crayfish and the bass is there to catch all he can. Cast as close as possible to the shore, sometimes letting the bait land right on the bank. Pull it into the water to give it some semblance of life. If the bass rises out of the water, creating a disturbance, do not set the hook. It is generally unknown that the bass disturbs water around a bug to wet it down so that SINGLE WATERLOOP Big muskelunge, like the one shown above, are taken with large-size minnow imitations and spoons. This Rainy River guide landed this monster in White Fish Bay, Minnesota. it can not rise. Then the fish turns around and seizes its prey. Attempting to set the hook too quickly is a common fault and the reason why so many big ones get away. It is difficult to give proper directions on this point. It is something that comes in- stinctively after practice. One of the most tempting lures is the mouse imitation, usually made of bucktail (Continued on page 130) Here are three knots that ate very useful to fishermen. -The jam knot is commonly used for fixing the line to hook or leader loop. The waterloop knot is excellent for typing leader ends. The leader loop shown will not slip. Inventions for August 87

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Camper Kinks That Simplify the Tasks of Auto Tourists HE few short weeks allotted to most of us for a vacation period can: be made much more enjoyable, should we choose auto touring, if we carefully plan ahead of time for the needs of the trip. These suggestions for auto tourists, as well as a few “do’s” and “don’ts,” have all been tried out and approved by ex- perienced campers. The larder or “tucker box” is perhaps the most important part of the camping equip- ment. Always carry. at least a (Continued on page 128) Carty good supply of gro- ceries, so you can stop off at ideal but out-of-the-way camp spots like that shown above. Inflate spare tire to double pressure at filling station before stopping for night, then use excess air to fill air mattress, Get hose fittings at auto supply store. eel NG BOARD WITH BOLT AND WING = REMOVABLE PLYBOARD TUCKER BOX ON THE LEFT RUNNING BOARD OF CAR Fishing Handikinks That Will Save Money for the Angler PSENG rods, be they bamboo or steel, are a vitally important part of any angler’s kit. The long bamboo pole with- out frills will always be a favorite with followers of Izaak Walton, but this fact remains—it is a nuisance to carry around. If one has a car, a pole carrier can be fashioned in a few minutes out of scrap pipe fittings. This carrier bolts on to the front and rear bumpers, and so can be removed very easily. The poles are tied Below: When rod ferrules stick, warm joint with match, then hold behind knees, straighten knees and spread them apatt. ow 37 PERMIT REAR DOOR TO OPEN PLAN OF KITCHEN BOX SHOWING HOW CHEAP NESTING SETS ARE ASSEMBLED IN THE TUCKER BOX FIG.A. RUBBER BOOT LACES ARE -INEXPENSIVE = AND- -COMFORTABLE WITHOUT LOOSENING a OTHE EYELET LACING 88 Modern Mechanix and Method for carrying fishpoles, Slot pipe to slip over bumper. Split top end of 12” pipe to form fork. = en J : : ae PRESSY BROKEN STEEL l : ; TOGETHER SHAFT AND SOLDER = LIQUID SOLDER 7 NON ENDS OF WIREYWY To make adjustable atti-backlash drag for reel, solder 56" length of valve stem to end plate. Cut off valve as shown below. Turn with valve cap to adjust pressure. VALVE AND 155 VALVE STEM | STEM JNSERTED =$ CUT TO $"LONG ADES ee AE TE VALVE HEAD 3 PRESSES HERE To repair broken steel rods, get length of spring steel wire which’ just fits inside rod. Smear liquid solder on wire, press into broken rod ends, and smooth joint. To make joints in bamboo pole saw into 4-ft. lengths at knuckles, drill holes, and glue in wooden plugs which make snug fit. Bamboo poles can be readily disjointed and carried inside the car. Drill 4” deep holes, and glue wooden plugs into one end of each section. Reinforce the bamboo =} ends with tape or stove pipe wire. 89 Inventions for August

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Streamlined SCOOTER Steers “Tear drop” streamlining with airplane type control gives this cabin scooter an appeal that no boy can resist. Young and old alike will stop to watch when this streamlined pushmobile job is brought out on the sidewalk for its first test run. 12 PLY MOUNTING BOARD OR SHEET. METAL COVERING we WINDOW À PAINT: CAR WHITE OR ALUMINUM THEN APPLY VARNISH CUT BOARD. 1X2! CLEATS Have youngster for whom scooter is built sit up against the plywood panel. Draw an outline for the streamlining which will allow him full head room when sitting. ADDITIONAL CLEAT FOR FOOT REST Both skates move parallel to each other for steering. Middle cleat, to which backs of skates are screwed, slides freely between front and back cleat. Lubricate ibe wood with laundry soap. form just back of seat. O GREAT is the appeal of this new varia- tion of the old time roller skate coaster that youngsters will swarm out from every- where to watch it, to push it, to ride in it. Perhaps it is the snugness of the little cabin that appeals; perhaps it is the air- plane type control which is the piece de re- sistance for everyone who has ever hank- cred to be a pilot; or perhaps it is that we are “tear-drop” conscious, because of auto manufacturer advertising. Anyway young and old alike stopped to watch when this streamlined cabin scooter was “put out on the road” for the first tests. The cost of the scooter is negligible. Enough roller skates for the entire job can be purchased at a dime store for 40 cents. Any lumber yard will supply %” fir ply- 0 Modern. Mechanix and View of completed car. Bali bearing roll- er skate wheels make it easy to push this cabin scooter down the sidewalk. with AIRPLANE JOYSTICK by WESTON FARMER wood for the sides, and the rest of the lum- ber is generally in the serap heap. Cut out the two side panels first, tacking them together lightly so they can both be sawed atthe same time. Lay out streamlined design so there is no wasted space, but still sufficient head room and leg room for the biggest lad that will use the scooter. After sawing out the two panels and cut- ting out door and windows as indicated on the plans, make the bottom of the coaster. Match together enough boards for a plat- form 18” wide and 30” long—if you use shiplap and trim off the outer laps but two boards will be needed. Screw 1”x4” cleats across the bottom, using two at the front for the steering arrangement. When mount- ing the rear skates on the cleat, bend the heel portion of the skates in a vise to fit snugly around the cleat. Fasten the skates in place with screws. The only complicated part of the entire construction is the airplane type steering control—and it isn’t at all hard to make. Rear skate wheels are screwed to scocter at two points. Below: Use 1⁄4" fir plywood for side panels, sawing out both at same time with compass saw or bandsaw. Fasten hinges in position before sawing out door, for accuracy. Drill &” holes in the toes of the two front skates, to serve as pivot holes. Cut out a hole in the sliding cleat for the end of the steering lever. Put heavy screws through the adjusting slots of the skates into the middle cleat, lining up the skates first. Mount the joystick between two braces, using a quarter inch bolt for a pivot, and the steering joystick is completed. Next set in the seat, slanting it at a com- fortable angle. Nail on the sides with 7 penny box nails, being sure they are paral- Jel. Use 1”x2” spacers along the top. The covering can be of heavy cardboard or tin 24”x36” in size. Use %” large head brads or tacks, not the pointed carpet tacks. The car is then ready for painting. White makes the best color, but any other color scheme may be used to suit the fancy. With friends taking turns pushing and riding, the lad for whom this coaster is built will be the envy of the neighborhood. SSS SECTION THRU THE PLATFORM tees 174" FIR PLYWOOD SIDES PHOTO SHOWING MOUNTING OF REAR ‘SKATE WHEELS Left: Bottom view showing steering arrangement. Above: Spring door latch is riveted te door; door stop is nailed to inside of side panel. Cut joystick out of 34-inch fir. Inventions for August 91

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PLACE MARK JUST ABOVE, MINIMUM AIR A SimPLe AIR-SPEEI INDICATOR NAIL AND GLUE ALL JOINTS a ACN TENT CANVAS, - SP es CORD CLOTHESLINE PULLEY LFlying Ghrills Are Yours D Constructional details for trailer plane are shown above. members, and any light, straight-grained wood for other parts. cotd to cushion landings, ometer of car, 98 Airspeed indicator shown above will prevent crashes, Strong disc wheels with rubber tires are necessary if towing plane considerable distance on the ground. Modern Mechanix and NAL BRACES 2" PLYWOOD: Straight-grained spruce should be used for all important Strips of inner tube may be used in place o! It may be calibrated against speed- shock CANVAS SEAT” With this Captive Plane es Zoom and bank in this trailer plane, with none of the dangers of real flight. No license is required. ITH the long summer days at hand thou- sands of air-minded boys will welcome this practical little trailer plane. It is simple to construct and enables anyone to pick up the essentials of airplane control with a minimum of risk and cost. Being entirely dependent upon a tow car, to which it is securely attached at all times during operation, and being definitely limited to a prescribed area of actual manip- ulation, the dangers ordinarily connected with preliminary flight instruction are com- pletely eliminated. Furthermore the plane itself does not have to be stressed to any particularly high standard of structural safety (though com- mon sense dictates sturdy and careful con- struction). The plans on the opposite page provide a method of construction which is unique in its simplicity and strength. They are more than adequate for the purpose intended. As will be seen from a glance at the dia- grams, either of two hitches may be em- ployed. In practice it will probably be found that both are needed: The double- boom hitch limits movements of the trailer to simple up and down flight and is recom- mended for the rank novice who has yet to master the intricacies of lateral control. Advanced “students” will revel in the free- dom of movement which the single-boom flexible-joint hitch permits. Lateral control and ,even banked turns are possible with this hook-up. As the plane is at all times within easy speaking distance of the tow car, instruc- Inventions for August wy TAPER BOOMS TOWARDS AXLE- HITCH TO REDUCE WEIGHT THIS END ba STOP BAR LIMITS MOVEMENT OF THE BOOM 4@— HINGE TO CROSS PIECE FIXED TO BUMPERS A LIGHT “TRUSSED SINGLE BOOM PERMITS FREER RANGE OF ACTION AND REQUIRES ACTUAL FLYING SKILL TO HANDLE SAFELY. No special knowledge of aviation is needed to build or fly captive plane, nor is license required. Auto is power unit. tion can be given during “flight” and errors of control pointed out immediately they become apparent. Any sudden decrease of speed by the tow car should be avoided while the trailer is aloft. A good plan is to have a second man in the car ready to signal any intention to slow down or stop. This will give the stu- au ample time to put the nose down and “land.” Better still, a simple air speed indicator can be made as shown in the drawings and the student coached to set the ship down the moment the pointer passes the mark indicating danger. This mark should be predetermined in actual tests to ascertain the exact speed required to maintain flight. This training plane is designed to oper- ate at speeds not to exceed 30 miles an hour. Unless a stronger and altogether more am- bitious type of plane is used this rule must be rigidly observed. As a matter of fact it may be said that no more speed is necessary than slightly over the bare amount required to keep the trainer in the air. Play safe and thus avoid trouble. The actual method of construction is cov- ered in the plans. It will be seen that the (Continued on page 126) 99

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SPLIT AND GROOVE BEFORE TURNING A COLONIAL with Adjustable by O. E. OLSON HERE are very few of us who do not ap- preciate the beauty of colonial furniture, especially where design and use are in har- mony with present conventions. In the simple and graceful lines of this lamp some of the spirit of Early America is recaptured. The soft and mellow tone of hard maple lends the final touch keeping it distinctly colonial. ~ Select clear seasoned hard maple from 3”x3"x33” stock to make the lamp post. Split the stock and saw a %”x14” groove down the center of each piece. Glue these pieces to- gether in their original position and clamp well. This method of making the hole for the light cord is much more accurate than boring, and saves a great deal of time. Use Linseed Oil Finish When the glue.is thoroughly dry set the stock in a large wood-turning lathe and turn to shape. Sand, finish and polish the work before removing it from the lathe. The type of finish may be either French polish or lin- seed oil with rubbed wax. The Jamp support is made to slide freely up or down, locking in place at any desired height. Turn the upper post or slide to a scant 1%” in diameter. Cut the ring lock channel on ‘the circle saw. If this machine is not available cut as you would in making a mortise. Bore the %4” lock holes 1” apart taking care that they are in the middle of the channel. Bore %” dowel holes in both ends of the post. In making the ring and lock follow all specifications closely to insure an easily ad- justed and well fitting lock. When the lamp arms are raised the ring should slide freely with a minimum of play. A slight rounding of some of the inside corners may be neces- sary to give smooth action. The arms are turned from 1”x1” stock to an end dimension of %”. The lower arm is somewhat longer and more diffi- cult to place due to the necessity of boring holes at an angle in the lock = 10” eae! ee ont ata aa aa eno aca z F ower F HOLES SLIDE Completed bridge lamp shown at upper left. Lamp support arms are fastened to lock assembly which slides up and down: on center poet locking in place at any desired height. Any kind of parchment or silk shade may be used on lamp. 106 Modern Mechanix and Bridge Lamp Shade Support piece. Determine carefully the angle needed before boring. Turn the decorative top for the post and the lamp socket block from one piece and separate with the parting tool. Bore holes as shown in the diagrams, using a %” bit for all wire outlet holes. The top of the cricket stool, which forms the base of the lamp, is turned from 1%” stock. Cut the center post hole on the lathe to a snug fit with lamp post, thereby insuring a perfectly vertical post assembly. Cut a template or turning pattern for the legs out of heavy cardboard. Turn three legs out of 2”x2” stock. Draw them up well to the template for uniformity. Locate and mark positions for the leg holes in the stool top, the legs being equal distances apart. This is simply done by constructing an equilateral triangle on the stool base, each corner thus marking a hole. Drilling the Leg Holes It is very difficult to bore all leg holes at a uniform angle without a drill press. If such a machine is not available it can be done by making a boring jig from 2” scrap wood stock. Bore a %” hole at an angle of forty degrees in this stock. Clamp the guide secure- ly to the cricket stool top over the leg hole position. The hole in the scrap stock will guide the drill for the Jeg hole. Bore all of the leg holes in this manner. Glue in the legs securely and test for levelness. In assembling the lamp glue the dowel pins in place and draw all unions tight. Care must be taken that the lamp stands vertical and in such a position that the extension arm is directly above one of the legs. Let the lamp stand for twenty-four hours, or until the glue is thoroughly dry. Then screw %” insulated bushings into the wire outlet holes in the bottom of the post and in the lamp fixture block. To simplify the task of wire threading pass a fine flexible wire or strong string through the post, then draw light cord through with it. Do likewise with the socket block, allow- ing enough free wire to permit adjustment of the extension arm. Use an adjustable sock- et fastened with a 3%” pipe nipple. KA 2g Circular inset above shows method of clamping boring jig block is bored as indicated for arms and fer lamp cord. Inventions for August to base of lamp, to aid in drilling holes for legs. Socket Standard pull chain socket is. fastened to socket block- 107.

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SBUILDING the <BODY of WINDOW DETAIL STUD DETAIL TRIM STUD TO SIZE AFTER BOLTING RIB IN POSITION

TOP SIDE- RAIL, OR PLATE

s 2 Pieces $ PLYWOOD 4 NAILED TOGETHER : | {her SCREEN F HALF ROUND MOLDING MIDDLE | ri ME oon stop msi i v 4 GUIDE rit

20GA.METAL THRESHOLD & DOOR STOP NOTE FLOOR FITS ROUND STUD

ee) Yi VAS BOTTOM ges

CROSS SECTION THRU FRAME AT DOOR» WINDOW: AND STUDDING Details of windows and door illustrate construction recom- mended. Flooring is laid to extreme edge of chassis sill frame except at door, as shown, and at wheel wells. Note that window stool and screen frame are hinged to permit window to be lowered. Auto door lock is best for door. 110

A neatly arranged interior, that is far from overcrowded, is a feature of “Aloha.” Here is a view looking forward. Covering the floor with linoleum adds a finishing touch. by ROBERT W. YORK PART II ITTED with a shower, telephone, berths, kitchen and plenty of storage space, “Aloha” without a doubt is the “trailer de luxe” for summer touring. Yet the body construction is no more difficult than the. average trailer. The body is built after the chassis is completed according to instructions cov- ered in Part I in the July issue. Check the chassis to be certain it is square and plumb. The wheel alignment must be true and at right angles to the line of pull, which will be the chassis centerline. Then you are ready to proceed with building up the body. Here a band saw would come in handy but if you haven’t one you will be in no worse position than the writer. It will be noted in the chassis draw- ings, given in Part I, that the flanges of the channel iron face outward. This is in order that a wood member 1%x1% may fit snugly in the channel. This sill may be placed in two ways, either by steaming and bend- ing to shape (see March, 1934, issue of MODERN MECHANIX AND INVENTIONS, page 109), or cutting in the required curve. In either case this wood sill is bolted to the channel iron using 14” stove bolts placed at 2’ centers. Next cut the required number of frame Modern Mechanix and “ALOHA” —‘Orailer de Luxe studs. The finished sizes should be 1”x2”x5’- 6”. At the dimensions shown on the plans %x%4x2” cleats are nailed on both faces of the studs to hold the side rail strips and plates. Notch out one end of each stud and the sill where the studs occur to form a snug mortise joint, and bolt the studs to the sill with 14” stove bolts as shown in Part I. Be sure that the outer faces of the studs are flush with the outer face of the sill. Nailing strips are now to be placed where the lower set of cleats occur. To get the correct curves for these members lay the raw material on the sill between their respective studs and mark.the outer curve of the sill at the same time keeping the inner edges in a straight line. Establish the respective angles at the ends for nailing to the studs to form a neat joint. This nailing strip need not be more

SS

, COVER INTERIOR WITH"

MASONITE

than %” thick and occurs only where disap- pearing windows are not used. A study of the details will explain existing condi- tions there. The top side rail or plate members are cut and fitted in a similar manner but inch stock is recommended here. Assuming that all the plate and nailing members are cut, take a pot of water-proof glue and use freely. Then nail the rails in place against the cleats using a fair size finishing nail. Temporarily brace the work so that it does not get out of square or plumb while the glue is drying. The roof is the next step and we begin by cutting the longitudinal truss. member, the.piece that runs from front to rear of the roof. Reference to the drawings will dis- (Continued on page 122) 4-3" (USE FOR RIB PATTERN) MASONITE TOP RAIL - OR PLATE

SHOWER IS LINED WITH ' MASONITE TO 2 INCHE

jë BELOW TOP RAIL OR LINE INSIDE OF WELLS WITH 20 GA. SHEET METAL OF ZING PAN | SILL j CABINET = = = ZINC PAN FRAMES ———— ee ae eae LOCKER SPACE —— i A a X'4 Pile = i Stock LUNOER BERTHA E EE “FLOORS ARE OF HALF- } THRUOUT

INCH PLYWOOD SCREWED | ~. TO WOOD-FILLED ] +s, IRON JOISTS) | Ss. `, . Pees aft

4 i, t gaat) = 2 HU : LONGITUDINAL SECTION SHOWING ROOF TRUSS AND FURTHER INTERIOR DETAIL. CN 204 "SQ. WHITE OAK FILLER PIECE

J IRON FRAME

14'~ 6" (OVERALL BODY LENGTH)

TOP PLATE OF TRAME STY 2"x 1" PIECES arx i" S

CUT TO SHAPE WHITE OAK SCREWED AND LINE RIBS UP SO THAT RIBS ARE OF HALF GLUED IN E CURVES ARE UNIFORM INCH PLYWOOD 2" BETWEEN STUDS

BEFORE TRIMMING TO STOVE BOLT FIT AT INDIVIDUAL STATIONS DEEP CUT TO SAME CURVE AS FORWARD END OF LONGITUDINAL TRUSS MEMBER

W NOTCH TRUSS \ | AND CENTER

STUD. or TO SHAPE AND OR SCI! SPLICED TO- TOGETHER,

GETHER.

TACK LIGHT BATTENS

L pr OVER RIBS BEFORE NOTCH RIB COVERING WITH 1/2" AND TRUSS MESH CHICKEN WIRE TO MAKE A

COTTON BATTING AND FIRM JOINT NOTE-USE FABRIKOID(sEE DETAIL) PLENTY OF GLUE AT ALL FRAME JOINTS

ROOF FRAMING PLAN 7. Studs, 23 in number, are bolted to chassis sill frame as shown in Part I. Front center stud, attached last, is not fastened to sill but to center rail because of trailer hitch. The pattern for the lengthwise truss of the roof is also used for laying out ribs. Tire pump develops air pressure in tanks under body to force water to the shower and sink, Inventions, for August lll

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FOR INVENTORS And Mechanical Minded Men Answers to Questions on Page 33 Ey patenting the invention. Send sketch or model and descrip- tion with search fee to a registered patent attorney. 1101 U. S.—1279 Foreign. Abraham Lincoln, 17 years. It confers on patentee the exclu- sive right to make, sell and use the invention covered by the patent. No. Pencil sketch and description will usually suffice, et SaaS Nm A form on which an inventor may execute his sketch and descrip- tion. When properly filled out it is documentary evidence of your conception of the invention. Because a layman or a lawyer in general practice is not learned in patent office practice. S 10 As soon as patent application covering the invention is filed in United States Patent Office and official receipt received. CLARENCE A. O’BRIEN Registered Patent Attorney 317-J Adams Building Washington, D. C. (Copyright Clarence A. O’Brien) ; Z ; Make a rough pen- i eil sketch of your invention, describe it fully, and send it } “ Small Ideas May Have Large Commercial Possibilities If you hope to realize profits from your invention, you must protect it with a United States Government. Patent. Otherwise you may find that all your time-.and labor have been lost, because it often hap- pens that other inventors are work- ing on the same idea. If you have an idea, take steps to get a patent at once! THE Free Book shown here was pre- pared for inventors, to show them exactly what steps they must take to secure a PATENT. If you have an idea, you should send for this book AT ONCE. It will tell you exactly how an application for a Patent is made, what infor- mation you must furnish your attorney, and what steps he must take in order to protect your interests. Remember, inventing an article is one thing—secur- ing the exclusive right to manufacture it, use it or sell it is another. Without a U. S. Patent, you cannot expect to reap the profits that your invention may make possible. Send at once for this book. After you get that, you'll know exactly what to do to protect yourself. 138 Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers STEP NO. 1 to me for prelimi- nary, search through U. S. Patent Office —fee $5.00. KNOW HOW to START. KNOW EACH STEP to TAKE Before Going Too Far With Your Ideas Very often, the patent procedure is what we call a “simple” one—as illustrated here. My FREE BOOK “How to Obtain a Patent” describes what to do and how to go about it. Send for it by all means—let me urge, however, that you take the first step (STEP NO. 1 to right) without further delay. It will prevent wasted work, mis-steps, and going ahead “in the dark”—your whole patent procedure depends upon the first step. Immediate Search Necessary A Search at the U. S. Patent Office will disclose one ef three things: That you have hit upon an entirely original idea—that you have suggested ‘patentable improvements upon an existing invention—or that your invention has been anticipated throughout, and you should drop it. You should have this information at once. The Search Fee for the First Step (the search) alae as Nee eee Sendtřor 777s FREE STEP NO. 2 My trained search- ers will then make a preliminary search of the pertinent U. 8S. Patents to deter- mine if your inyen- tionis probably pat- į entable, STEP NO. 3 | My complete report of search and opin- ion on patentability will be mailed to | yeu with copies of U. S. Patents that T consider nearest to your invention. obtaining ea patent) will be thoroughly explained to you in my FREE BOOK. My FREE BOOK tells everything you need to know about patents. I will mail this book upon receipt of your letter requesting search—or if you want to read it before having search made, simply fill out the coupon below. ALSO FREE RECORD OF INVENTION BLANK This FREE Record of Invention Form en- ables you to make in convenient form a sketch of your idea and have it witnessed in a manner of value to you should the oceasion for evidence arise. MAIL THIS COUPON TODAY and obtain my FREE BOOK and Record of Invention Form. STEP NO. 4 If you decide to make patent appli- cation, for customary fees explained in my booklet, my drafts- men will make draw- ings and proper pa- f pers will bo pre- pared for presenta- | tion of your inven- tion to the Patent Examiner. LARENCE A. O'BRIEN REGISTERED PATENT ATTORNEY | 317-J ADAMS BUILDING WASHINGTON, D.C. Please send me your FREE BOOK, “How to Obtain a Patent,” and your “Record of Invention” Form, without any cost or obligation on my part. (Important: Write or print name plainly) Thank You for Mentioning Modern Mechanix and Inventions for August When Writing to Advertisers 139

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